Economic life of the individual in society, as we know it, involves

four claims. One is a claim to the control of certain corporeal

things, the natural media on which human existence depends. Another is

a claim to freedom of industry and contract as an individual asset,

apart from free exercise of one's powers as a phase of personality,

since in a highly organized society the general existence may depend

to a large extent upon individual labor in specialized occupations,

and the power to labor freely at one's chosen occupation may be one's

chief asset. Third, there is a claim to promised advantages, to

promised performances of pecuniary value by others, since in a complex

economic organization with minute division of labor and enterprises

extending over long periods, credit more and more replaces corporeal

wealth as the medium of exchange and agency of commercial activity.

Fourth, there is a claim to be secured against interference by

outsiders with economically advantageous relations with others,

whether contractual, social, business, official or domestic. For not

only do various relations which have an economic value involve claims

against the other party to the relation, which one may demand that the

law secure, but they also involve claims against the world at large

that these advantageous relations, which form an important part of the

substance of the individual, shall not be interfered with. Legal

recognition of these individual claims, legal delimitation and

securing of individual interests of substance is at the foundation of

our economic organization of society. In civilized society men must be

able to assume that they may control, for purposes beneficial to

themselves, what they have discovered and appropriated to their own

use, what they have created by their own labor and what they have

acquired under the existing social and economic order. This is a

jural postulate of civilized society as we know it. The law of

property in the widest sense, including incorporeal property and the

growing doctrines as to protection of economically advantageous

relations, gives effect to the social want or demand formulated in

this postulate. So also does the law of contract in an economic order

based upon credit. A social interest in the security of acquisitions

and a social interest in the security of transactions are the forms of

the interest in the general security which give the law most to do.

The general safety, peace and order and the general health are secured

for the most part by police and administrative agencies. Property and

contract, security of acquisitions and security of transactions are

the domain in which law is most effective and is chiefly invoked.

Hence property and contract are the two subjects about which

philosophy of law has had the most to say.

In the law of liability, both for injuries and for undertakings,

philosophical theories have had much influence in shaping the actual

law. If they have grown out of attempts to understand and explain

existing legal precepts, yet they have furnished a critique by which

to judge those precepts, to shape them for the future and to build new

ones out of them or upon them. This is much less true of philosophical

theories of property. Their role has not been critical or creative but

explanatory. They have not shown how to build but have sought to

satisfy men with what they had built already. Examination of these

theories is an illuminating study of how philosophical theories of law

grow out of the facts of time and place as explanations thereof and

then are given universal application as necessarily explanatory or

determinative of social and legal phenomena for all time and in every

place. It has been said that the philosophy of law seeks the permanent

or enduring element in the law of the time and place. It would be

quite as true to say that it seeks to find in the law of the time and

place a permanent or enduring picture of universal law.

It has been said that the individual in civilized society claims to

control and to apply to his purposes what he discovers and reduces to

his power, what he creates by his labor, physical or mental, and what

he acquires under the prevailing social, economic or legal system by

exchange, purchase, gift or succession. The first and second of these

have always been spoken of as giving a "natural" title to property.

Thus the Romans spoke of them as modes of "natural acquisition" by

occupation or by specification (making a species, i.e., creation).

Indeed, taking possession of what one discovers is so in accord with a

fundamental human instinct that discovery and occupation have stood in

the books ever since substantially as the Romans stated them. A

striking example of the extent to which this doctrine responds to

deep-seated human tendencies is afforded by the customs as to

discovery of mineral on the public domain upon which American mining

law is founded and the customs of the old whale-fishery as to

fast-fish and loose-fish which were recognized and given effect by the

courts. But there is a difficulty in the case of creation or

specification in that except where the creation is mental only

materials must be used, and the materials or tools employed may be

another's. Hence Grotius reduced creation by labor to occupation,

since if one made from what he discovered, the materials were his by

occupation, and if not, the title of others to the materials was

decisive. This controversy as to the respective claims of him who

creates by labor and him who furnishes the materials goes back to the

Roman jurists of the classical period. The Proculians awarded the

thing made to the maker because as such it had not existed previously.

The Sabinians awarded it to the owner of the materials because without

materials the new thing could not have been made. In the maturity of

Roman law a compromise was made, and various compromises have obtained

ever since. In modern times, however, the claim of him who creates has

been urged by a long line of writers beginning with Locke and

culminating in the socialists. The Romans spoke of what one acquired

under the prevailing social, economic or legal system as held by

"civil" acquisition and conceived that the principle _suum cuique

tribuere_ secured the thing so acquired as being one's own.

Roman jurists recognized that certain things were not subject to

acquisition in any of the foregoing ways. Under the influence of the

Stoic idea of _naturalis ratio_ they conceived that most things were

destined by nature to be controlled by man. Such control expressed

their natural purpose. Some things, however, were not destined to be

controlled by individuals. Individual control would run counter to

their natural purpose. Hence they could not be the subjects of private

ownership. Such things were called _res extra commercium_. They might

be excluded from the possibility of individual ownership in any of

three ways. It might be that from their nature they could only be

used, not owned, and from their nature they were adapted to general

use. These were _res communes_. Or it might be that they were made for

or from their nature they were adapted to public use, that is use for

public purposes by public functionaries or by the political

community. These were _res publicae_. Again it might be because they

had been devoted to religious purposes or consecrated by religious

acts inconsistent with private ownership. Such things were _res

sanctae_, _res sacrae_ and _res religiosae_. In modern law, as a

result of the medieval confusion of the power of the sovereign to

regulate the use of things (_imperium_) with ownership (_dominium_)

and of the idea of the corporate personality of the state, we have

made the second category into property of public corporations. And

this has required modern systematic writers to distinguish between

those things which cannot be owned at all, such as human beings,

things which may be owned by public corporations but may not be

transferred, and things which are owned by public corporations in full

dominion. We are also tending to limit the idea of discovery and

occupation by making _res nullius_ (e.g., wild game) into _res

publicae_ and to justify a more stringent regulation of individual use

of _res communes_ (e.g., of the use of running water for irrigation or

for power) by declaring that they are the property of the state or

are "owned by the state in trust for the people." It should be said,

however, that while in form our courts and legislatures seem thus to

have reduced everything but the air and the high seas to ownership, in

fact the so-called state ownership of _res communes_ and _res nullius_

is only a sort of guardianship for social purposes. It is _imperium_,

not _dominium_. The state as a corporation does not own a river as it

owns the furniture in the state house. It does not own wild game as it

owns the cash in the vaults of the treasury. What is meant is that

conservation of important social resources requires regulation of the

use of _res communes_ to eliminate friction and prevent waste, and

requires limitation of the times when, places where and persons by

whom _res nullius_ may be acquired in order to prevent their

extermination. Our modern way of putting it is only an incident of the

nineteenth-century dogma that everything must be owned.

It is not hard to see how the Romans came to the distinction that has

obtained in the books ever since. Some things were part of the

Roman's _familia_, were used by him upon the public domain which he

occupied or were traded by him to those with whom he had legal power

of commercial intercourse. He acquired them by discovery, by capture

in war, by labor in agriculture or as an artisan, by commercial

transactions or by inheritance. For these things private actions lay.

Other things were no part of his or of anyone's household. They were

used for political or military or religious purposes or, like rivers,

were put to use by everyone without being consumed thereby. As to

these, the magisterial rather than the judicial power had to be

invoked. They were protected or use of them was regulated and secured

by interdicts. One could not acquire them so as to maintain a private

action for them. Thus some things could be acquired and conveyed and

some could not. In order to be valid, however, according to juristic

theory the distinction must lie in the nature of things, and it was

generalized accordingly.

In a time when large unoccupied areas were open to settlement and

abundant natural resources were waiting to be discovered and

developed, a theory of acquisition by discovery and appropriation of

_res nullius_, reserving a few things as _res extra commercium_, did

not involve serious difficulty. On the other hand, in a crowded world,

the theory of _res extra commercium_ comes to seem inconsistent with

private property and the theory of discovery and occupation to involve

waste of social resources. As to the latter, we may compare the law of

mining and of water rights on the public domain, which developed along

lines of discovery and reduction to possession under the conditions of

1849 and the federal legislation of 1866 and 1872, with recent

legislation proceeding on ideas of conservation of natural resources.

The former requires more consideration. For the argument that excludes

some things from private ownership may seem to apply more and more to

land and even to movables. Thus Herbert Spencer says, in explaining

_res communes_:

"If one individual interferes with the relations of another to the

natural media upon which the latter's life depends, he infringes the

like liberties of others by which his own are measured."

But if this is true of air and of light and of running water, men will

insist upon inquiring why it is not true of land, of articles of food,

of tools and implements, of capital and even, it may be, of the

luxuries upon which a truly human life depends. Accordingly, how to

give a rational account of the so-called natural right of property and

how to fix the natural limits of that right became vexed questions of

philosophical jurisprudence.

Antiquity was content to maintain the economic and social _status quo_

or at least to idealize it and maintain it in an ideal form. The

Middle Ages were content to accept _suum cuique tribuere_ as

conclusive. It was enough that acquisition of land and movables and

private ownership of them were part of the existing social system.

Upon the downfall of authority, seventeenth-and eighteenth-century

jurists sought to put natural reason behind private property as

behind all other institutions. When Kant had undermined this

foundation, the nineteenth-century philosophical jurists sought to

deduce property from a fundamental metaphysical datum; the historical

jurists sought to record the unfolding of the idea of private property

in human experience, thus showing the universal idea; the utilitarian

demonstrated private property by his fundamental test and the

positivist established its validity and necessity by observation of

human institutions and their evolution. In other words, here as

elsewhere, when eighteenth-century natural law broke down, jurists

sought to put new foundations under the old structure of natural

rights, just as natural rights had been put as a new foundation to

support institutions which theretofore had found a sufficient basis in

authority.

Theories by which men have sought to give a rational account of

private property as a social and legal institution may be arranged

conveniently in six principal groups, each including many forms. These

groups may be called: (1) Natural-law theories, (2) metaphysical

theories, (3) historical theories, (4) positive theories, (5)

psychological theories and (6) sociological theories.

Of the natural-law theories, some proceed on a conception of

principles of natural reason derived from the nature of things, some

on conceptions of human nature. The former continue the ideas of the

Roman lawyers. They start with a definite principle found as the

explanation of a concrete case and make it a universal foundation for

a general law of property. As it has been put, they find a postulate

of property and derive property therefrom by deduction. Such theories

usually start either from the idea of occupation or from the idea of

creation through labor. Theories purporting to be based on human

nature are of three forms. Some proceed on a conception of natural

rights, taken to be qualities of human nature reached by reasoning as

to the nature of the abstract man. Others proceed upon the basis of a

social contract expressing or guaranteeing the rights derived by

reason from the nature of man in the abstract. In recent thinking a

third form has arisen which may be called an economic natural law. In

this form of theory, a general foundation for property is derived from

the economic nature of man or from the nature of man as an economic

entity. These are modern theories of natural law on an economic

instead of an ethical basis.

Grotius and Pufendorf may be taken as types of the older natural-law

theories of property. According to Grotius, all things originally were

_res nullius_. But men in society came to a division of things by

agreement. Things not so divided were afterward discovered by

individuals and reduced to possession. Thus things came to be

subjected to individual control. A complete power of disposition was

deduced from this individual control, as something logically implied

therein, and this power of disposition furnished the basis for

acquisition from others whose titles rested directly or indirectly

upon the natural foundation of the original division by agreement or

of subsequent discovery and occupation. Moreover, it could be argued

that the control of an owner, in order to be complete, must include

not only the power to give _inter vivos_ but also the power to provide

for devolution after death as a sort of postponed gift. Thus a

complete system of natural rights of property was made to rest

mediately or immediately upon a postulated original division by

agreement or a subsequent discovery and occupation. This theory should

be considered in the light of the facts of the subject on which

Grotius wrote and of the time when he wrote. He wrote on international

law in the period of expansion and colonization at the beginning of

the seventeenth century. His discussion of the philosophical

foundation of property was meant as a preliminary to consideration of

the title of states to their territorial domain. As things were, the

territories of states had come down in part from the past. The titles

rested on a sort of rough adjustment among the invaders of the Roman

empire. They could be idealized as the result of a division by

agreement and of successions to, or acquisitions from, those who

participated therein. Another part represented new "natural" titles

based on discovery and occupation in the new world. Thus a Romanized,

idealized scheme of the titles by which European states of the

seventeenth century held their territories becomes a universal theory

of property.

Pufendorf rests his whole theory upon an original pact. He argues that

there was in the beginning a "negative community." That is, all things

were originally _res communes_. No one owned them. They were subject

to use by all. This is called a negative community to distinguish it

from affirmative ownership by co-owners. He declares that men

abolished the negative community by mutual agreement and thus

established private ownership. Either by the terms of this pact or by

a necessary implication what was not occupied then and there was

subject to acquisition by discovery and occupation, and derivative

acquisition of titles proceeding from the abolition of the negative

community was conceived to be a further necessary implication.

In Anglo-American law, the justification of property on a natural

principle of occupation of ownerless things got currency through

Blackstone. As between Locke on the one side and Grotius and Pufendorf

on the other, Blackstone was not willing to commit himself to the need

of assuming an original pact. Apparently he held that a principle of

acquisition by a temporary power of control co-extensive with

possession expressed the nature of man in primitive times and that

afterwards, with the growth of civilization, the nature of man in a

civilized society was expressed by a principle of complete permanent

control of what had been occupied exclusively, including as a

necessary incident of such control the _ius disponendi_. Maine has

pointed out that this distinction between an earlier and a later stage

in the natural right of property grew out of desire to bring the

theory into accord with Scriptural accounts of the Patriarchs and

their relations to the land grazed by their flocks. In either event

the ultimate basis is taken to be the nature of man as a rational

creature, expressed in a natural principle of control of things

through occupation or in an original contract providing for such

ownership.

With the revival of natural law in recent years a new phase of the

justification of property upon the basis of human nature has arisen.

This was suggested first by economists who deduced property from the

economic nature of man as a necessity of the economic life of the

individual in society. Usually it is coupled with a psychological

theory on the one side and a social-utilitarian theory on the other

side. In the hands of writers on philosophy of law it has often taken

on a metaphysical color. From another standpoint, what are essentially

natural-law theories have been advocated by socialists, either

deducing a natural right of the laborer to the whole produce of his

labor from a "natural" principle of creation or carrying out the idea

of natural qualities of the individual human being to the point of

denying all private property as a "natural" institution and deducing

a general regime of _res communes_ or _res publicae_.

Metaphysical theories of property are part of the general movement

that replaced seventeenth-and eighteenth-century theories of natural

rights, founded on the nature of the abstract man or on an assumed

compact, by metaphysical theories. They begin with Kant. He first sets

himself to justify the abstract idea of _a_ law of property--the idea

of a system of "external _meum_ and _tuum_." Here, as everywhere else,

he begins with the inviolability of the individual human personality.

A thing is rightfully mine, he says, when I am so connected with it

that anyone who uses it without my consent does me an injury. But to

justify the law of property we must go beyond cases of possession

where there is an actual physical relation to the object and

interference therewith is an aggression upon personality. The thing

can only be mine for the purposes of a legal system of _meum_ and

_tuum_ where I will be wronged by another's use of it when it is not

actually in my possession. This raises in the first instance the

question "How is a merely juridical or rational [as distinguished from

a purely physical] possession possible?" He answers the question by a

metaphysical version of the occupation theory of the eighteenth

century. Conceding that the idea of a primitive community of things is

a fiction, the idea of a logically original community of the soil and

of the things upon it, he says, has objective reality and practical

juridical reality. Otherwise mere objects of the exercise of the will,

exempted therefrom by operation of law, would be raised to the dignity

of free-willing subjects, although they have no subjective claim to be

respected. Thus the first possessor founds upon a common innate right

of taking possession, and to disturb him is a wrong. The first taking

of possession has "a title of right" behind it in the principle of the

original common claim to possession. It results that this taker

obtains a control "realized by the understanding and independent of

relations of space," and he or those who derive from him may possess a

parcel of land although remote from it physically. Such a possession

is only possible in a state of civil society. In civil society, a

declaration by word or act that an external thing is mine and making

it an object of the exercise of my will is "a juridical act." It

involves a declaration that others are under a duty of abstaining from

the use of the object. It also involves an admission that I am bound

in turn toward all others with respect to the objects they have made

"externally theirs." For we are brought to the fundamental principle

of justice that requires each to regulate his conduct by a universal

rule that will give like effect to the will of others. This is

guaranteed by the legal order in civil society and gives us the regime

of external mine and thine. Having thus worked out a theory of _meum_

and _tuum_ as legal institutions, Kant turns to a theory of

acquisition, distinguishing an original and primary from a derived

acquisition. Nothing is originally mine without a juridical act. The

elements of this legal transaction of original acquisition are three:

(1) "Prehension" of an object which belongs to no one; (2) an act of

the free will interdicting all others from using it as theirs; (3)

appropriation as a permanent acquisition, receiving a lawmaking force

from the principle of reconciling wills according to a universal law,

whereby all others are obliged to respect and act in conformity to the

will of the appropriator with respect to the thing appropriated. Kant

then proceeds to work out a theory of derivative acquisition by

transfer or alienation, by delivery or by contract, as a legal giving

effect to the individual will by universal rules, not incompatible

with a like efficacy in action of all other wills. This metaphysical

version of the Roman theory of occupation is evidently the link

between the eighteenth century and Savigny's aphorism that all

property is founded in adverse possession ripened by prescription.

When Kant's theory is examined it will be found to contain both the

idea of occupation and the idea of compact. Occupation has become a

legal transaction involving a unilateral pact not to disturb others in

respect of their occupation of other things. But the pact does not

derive its efficacy from the inherent moral force of a promise as

such or the nature of man as a moral creature which holds him to

promises. Its efficacy is not found in qualities of promises or of

men, but in a principle of reconciling wills by a universal law, since

that principle requires one who declares his will as to object A to

respect the declaration of his neighbor's will as to object B. On the

other hand, the idea of creation is significantly absent. Writing at

the end of the eighteenth century, in view of the ideas of Rousseau,

who held that the man who first laid out a plot of ground and said,

"This is mine," should have been lynched, and of the interferings with

vested rights in Revolutionary France, Kant was not thinking how those

who had not might claim a greater share in what they produced but how

those who had might claim to hold what they had.

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