'Avoid, old Satanas!' I exclaim, if any man attempts to fling dust in

my eyes by false syllogism, or any mode of dialectic sophism. And in

relation to this particular subject of value, I flatter myself that in

a paper expressly applied to the exposure of Mr. Malthus's blunders in

his Political Economy, I have made it impossible for Mr. Malthus, even

though he should take to his assistance seven worse logicians than

himself, to put down my light with their darkness. Meantime, as a

labour of shorter compass, I will call the reader's attention to the

following blunder, in a later work of Mr. Malthus's--viz. a pamphlet

of eighty pages, entitled, _The Measure of Value, stated and applied_

(published in the spring of the present year). The question proposed

in this work is the same as that already discussed in his Political

Economy--viz. What is the measure of value? But the answer to it is

different: in the Political Economy, the measure of value was

determined to be a mean between corn and labour; in this pamphlet, Mr.

Malthus retracts that opinion, and (finally, let us hope) settles it

to his own satisfaction that the true measure is labour; not the

quantity of labour, observe, which will produce X, but the quantity

which X will command. Upon these two answers, and the delusions which

lie at their root, I shall here forbear to comment; because I am now

chasing Mr. Malthus's _logical_ blunders; and these delusions are not

so much logical as economic: what I now wish the reader to attend

to--is the blunder involved in the question itself; because that

blunder is not economic, but logical. The question is--what is the

measure of value? I say then that the phrase--'measure of value' is an

equivocal phrase; and, in Mr. Malthus's use of it, means indifferently

that which determines value, in relation to the _principium essendi_,

and that which determines value, in relation to the _principium

cognoscendi_. Here, perhaps, the reader will exclaim--'Avoid,

Satanas!' to me, falsely supposing that I have some design upon his

eyes, and wish to blind them with learned dust. But, if he thinks

_that_, he is in the wrong box: I must and will express scholastic

phrases; but, having once done this, I am then ready to descend into

the arena with no other weapons than plain English can furnish. Let us

therefore translate '_measure of value_' into '_that which determines

value_:' and, in this shape, we shall detect the ambiguity of which I

complain. For I say, that the word _determines_ may be taken

subjectively for what determines X in relation to our knowledge, or

objectively for what determines X in relation to itself. Thus, if I

were to ask--'What determined the length of the racecourse?' and the

answer were--'The convenience of the spectators who could not have

seen the horses at a greater distance,' or 'The choice of the

subscribers,' then it is plain that by the word 'determined,' I was

understood to mean 'determined objectively,' _i. e._ in relation to

the existence of the object; in other words, what _caused_ the

racecourse to be this length rather than another length: but, if the

answer were--'An actual admeasurement,' it would then be plain that by

the word 'determined,' I had been understood to mean 'determined

subjectively,' _i. e._ in relation to our knowledge;--what ascertained

it?--Now, in the objective sense of the phrase, 'determiner of value,'

the measure of value will mean _the ground of value_: in the

subjective sense, it will mean _the criterion of value_. Mr. Malthus

will allege that he is at liberty to use it in which sense he pleases.

Grant that he is, but not therefore in both. Has he then used it in

both? He will, perhaps, deny that he has, and will contend that he has

used it in the latter sense as equivalent to the _ascertainer_ or

_criterion of value_. I answer--No: for, omitting a more particular

examination of his use in this place, I say that his use of any word

is peremptorily and in defiance of his private explanation to be

extorted from the use of the corresponding term in him whom he is

opposing. Now he is opposing Mr. Ricardo: his _labour which X

commands_--is opposed to Mr. Ricardo's _quantity of labour which will

produce X_. Call the first A, the last B. Now, in making B the

determiner of value, Mr. Ricardo means that B is the ground of value:

_i. e._ that B is the answer to the question--what makes this hat of

more value than this pair of shoes? But, if Mr. Malthus means by A the

same thing, when by his own confession he has used the term _measure

of value_ in two senses: on the other hand, if he does not mean the

same thing, but simply the _criterion_ of value, then he has not used

the word in my sense which opposes him to Mr. Ricardo. And yet he

advances the whole on that footing. On either ground, therefore, he is

guilty of a logical error, which implies that, so far from answering

his own question, he did not know what his own question was.

LETTER IN REPLY TO HAZLITT CONCERNING THE MALTHUSIAN DOCTRINE OF

POPULATION.

THE LION'S HEAD.[27]

_To the Editor of the London Magazine._

_Westmoreland, November 4, 1823_.

My dear Sir,--This morning I received your parcel, containing amongst

other inclosures, the two last numbers of your journal. In the first

of these is printed a little paper of mine on Mr. Malthus; and in the

second I observe a letter from Mr. Hazlitt--alleging two passages from

the 403rd and 421st pages of his _Political Essays_ as substantially

anticipating all that I had said. I believe that he _has_ anticipated

me: in the passage relating to the geometric and arithmetic ratios, it

is clear that he has: in the other passage, which objects to Mr.

Malthus's use of the term _perfection_, that he has represented it

under contradictory predicates, it is not equally clear; for I do not

find my own meaning so rigorously expressed as to exclude another[28]

interpretation even now when I know what to look for; and, without

knowing what to look for, I should certainly not have found it: on

the whole, however, I am disposed to think that Mr. Hazlitt's meaning

is the same as my own. So much for the _matter_ of Mr. Hazlitt's

communication: as to the _manner_, I am sorry that it is liable to a

construction which perhaps was not intended. Mr. Hazlitt says--'I do

not wish to bring any charge of plagiarism in this case;' words which

are better fitted to express his own forbearance, than to exonerate me

from the dishonour of such an act. But I am unwilling to suppose that

Mr. Hazlitt has designedly given this negative form to his words. He

says also--'as I have been a good deal abused for my scepticism on

that subject, I do not feel quite disposed that any one else should

run away with the credit of it.' Here again I cannot allow myself to

think that Mr. Hazlitt meant deliberately to bring me before the

reader's mind under the odious image of a person who was 'running

away' with the credit of another. As to 'credit,' Mr. Hazlitt must

permit me to smile when I read that word used in that sense: I can

assure him that not any abstract consideration of credit, but the

abstract idea of a credi_tor_ (often putting on a concrete shape, and

sometimes the odious concrete of a dun) has for some time past been

the animating principle of my labours. Credit therefore, except in the

sense of twelve months' credit where now alas! I have only six, is no

object of my search: in fact I abhor it: for to be a 'noted' man is

the next bad thing to being a 'protested' man. Seriously, however, I

sent you this as the first of four notes which I had written on the

logical blunders of Mr. Malthus (the other three being taken not from

his Essay on Population, but from works more expressly within the

field of Political Economy): not having met with it elsewhere, I

supposed it my own and sent it to complete the series: but the very

first sentence, which parodies the words of Chancellor Oxenstiern--('Go

and see--how _little_ logic is required,' &c.), sufficiently shows that,

so far from arrogating any great merit to myself for this discovery, I

thought it next to miraculous that it should have escaped any previous

reviewer of Mr. Malthus.--I must doubt, by the way, whether Mr. Hazlitt

has been 'a good deal abused' for these specific arguments against Mr.

Malthus; and my reason for doubting is this: about ten or twelve years

ago, happening to be on a visit to Mr. Southey, I remember to have met

with a work of Mr. Hazlitt's on this subject--_not_ that which he

quotes, but another (_Reply to Malthus_) which he refers to as

containing the same opinions (either _totidem verbis_, or in substance).

In Mr. Southey's library, and in competition with Mr. Southey's

conversation, a man may be pardoned for not studying any one book

exclusively: consequently, though I read a good deal of Mr. Hazlitt's

_Reply_, I read it cursorily: but, in all that I _did_ read, I remember

that the arguments were very different from those which he now alleges;

indeed it must be evident that the two logical objections in question

are by no means fitted to fill an octavo volume. My inference therefore

is--that any 'abuse,' which Mr. Hazlitt may have met with, must have

been directed to something else in his _Reply_; and in fact it has

happened to myself on several occasions to hear this book of Mr.

Hazlitt's treated as unworthy of his talents; but never on account of

the two arguments which he now claims. I would not be supposed, in

saying this, to insinuate any doubt that these arguments are really to

be found in the _Reply_; but simply to suggest that they do not come

forward prominently or constitute the main argument of that book: and

consequently, instead of being opposed, have been overlooked by those

who have opposed him as much as they were by myself.

[Footnote 27: This was the heading under which correspondence appeared

in _The London Magazine_ at that date.--H.]

[Footnote 28: What other interpretation? An interpretation which makes

Mr. Hazlitt's argument coincide with one frequently urged against Mr.

Malthus--viz. 'that in fact he himself relies practically upon _moral

restraint_ as one great check to Population, though denying that any

great revolution in the moral nature of man is practicable.' But so

long as Mr. Malthus means, by a _great revolution_, a revolution in

the sense which he imputes to Mr. Godwin--to Condorcet, &c. viz. a

revolution amounting to absolute perfection, so long there is no

logical error in all this: Mr. Malthus may consistently rely upon

moral restraint for getting rid, suppose, of ninety cases out of every

hundred which at present tend to produce an excessive population, and

yet maintain that even this tenth of the former excess would be

sufficient, at a certain stage of population, to reproduce famines,

&c., _i. e._ to reproduce as much misery and vice as had been got rid

of. Here there is an absolute increase of moral restraint, but still

insufficient for the purpose of preventing misery, &c. For, as soon as

the maximum of population is attained, even one single birth in excess

(_i. e._ which does more than replace the existing numbers)--_à

fortiori_, then, one-tenth of the present excess (though implying that

the other nine-tenths had been got rid of by moral restraint) would

yet be sufficient to prevent the attainment of a state of perfection.

And, if Mr. Malthus had so shaped his argument, whether wrong or

right--he would not have offended in point of _logic_: his logical

error lies in supposing a state of perfection already existing and yet

as brought to nothing by this excess of births: whereas it is clear

that such an excess may operate to prevent, but cannot operate to

destroy a state of perfection; because in such a state no excess could

ever arise; for, though an excess may co-exist with a vast increase of

moral restraint, it cannot co-exist with entire and perfect moral

restraint; and nothing less than _that_ is involved in the term

'perfection.' A perfect state, which allows the possibility of the

excess here spoken of, is already an imperfect state. Now, if Mr.

Hazlitt says that this is exactly what he means, I answer that I

believe it is; because I can in no other way explain his sixth

sentence--from the words 'but it is shifting the question' to the end

of that sentence. Yet again the seventh sentence (the last) is so

expressed as to be unintelligible to me. And all that precedes the

sixth sentence, though very intelligible, yet seems the precise

objection which I have stated above, and which I think untenable. Nay,

it is still less tenable in Mr. Hazlitt's way of putting it than as

usually put: for to represent Mr. Malthus as saying that, 'if reason

should ever get the mastery over all our actions, we shall then be

governed _entirely_ by our physical appetites' (which are Mr.

Hazlitt's words), would be objected to even by an opponent of Mr.

Malthus: why '_entirely_?' why more than we are at present? The utmost

amount of the objection is this:--That, relying so much upon moral

restraint _practically_, Mr. Malthus was bound to have allowed it more

weight _speculatively_, but it is unreasonable to say that in his

ideal case of perfection Mr. Malthus has allowed no weight at all to

moral restraint: even he, who supposes an increased force to be

inconsistent with Mr. Malthus's theory, has no reason to insist upon

his meaning a diminished force.]

Finally, Mr. Hazlitt calls the coincidence of my objections with his

own 'striking:' and thus (though unintentionally, I dare say) throws

the reader's attention upon it as a very surprising case. Now in this

there is a misconception which, apart from any personal question

between Mr. Hazlitt and myself, is worth a few words on its own

account for the sake of placing it in a proper light. I affirm then

that, considering its nature, the coincidence is _not_ a striking one,

if by 'striking' be meant surprising: and I affirm also that it would

not have been the more striking if, instead of two, it had extended to

two hundred similar cases. Supposing that a thousand persons were

required severally to propose a riddle, no conditions or limitations

being expressed as to the terms of the riddle, it would be surprising

if any two in the whole thousand should agree: suppose again that the

same thousand persons were required to solve a riddle, it would now be

surprising if any two in the whole thousand should differ. Why?

Because, in the first case, the act of the mind is an act of

synthesis; and there we may readily conceive a thousand different

roads for any one mind; but, in the second case, it is an analytic

act; and there we cannot conceive of more than one road for a thousand

minds. In the case between Mr. Hazlitt and myself there was a double

ground of coincidence for any possible number of writers: first the

object was given; _i. e._ we were not left to an unlimited choice of

the propositions we were to attack; but Mr. Malthus had himself, by

insisting on two in particular (however erroneously) as the capital

propositions of his system, determined our attention to these two as

the assailable points: secondly, not only was the object given--_i. e._

not only was it predetermined for us where[29] the error must lie,

if there were an error; but the nature of that error, which happened

to be logical, predetermined for us the nature of the solution. Errors

which are such _materialiter_, _i. e._ which offend against our

_knowing_, may admit of many answers--involving more and less of

truth. But errors, which are such logically, _i. e._ which offend

against the form (or internal law) of our _thinking_, admit of only

one answer. Except by failing of any answer at all, Mr. Hazlitt and I

could not _but_ coincide: as long as we had the same propositions to

examine (which were not of our own choice, but pointed out to us _ab

extra_), and as long as we understood those propositions in the same

sense, no variety was possible except in the expression and manner of

our answers; and to that extent a variety exists. Any other must have

arisen from our understanding that proposition in a different sense.

[Footnote 29: 'Where the error must lie'--_i. e._ to furnish a

sufficient answer _ad hominem_: otherwise it will be seen that I do

not regard either of the two propositions as essential to Mr.

Malthus's theory: and therefore to overthrow those propositions is not

to answer that theory. But still, if an author will insist on

representing something as essential to his theory which is not so, and

challenges opposition to it,--it is allowable to meet him on his own

ground.]

My answer to Mr. Hazlitt therefore is--that in substance I think his

claim valid; and though it is most true that I was not aware of any

claim prior to my own, I now formally forego any claim on my own part

to the credit of whatsoever kind which shall ever arise from the two

objections to Mr. Malthus's logic in his _Essay on Population_. In

saying this, however, and acknowledging therefore a coincidence with

Mr. Hazlitt in those two arguments, I must be understood to mean a

coincidence only in what really belongs to them; meantime Mr. Hazlitt

has used two expressions in his letter to yourself which seem to

connect with those propositions other opinions from which I dissent:

that I may not therefore be supposed to extend my acquiescence in Mr.

Hazlitt's views to these points, I add two short notes upon them:

which however I have detached from this letter--as forming no proper

part of its business.--Believe me, my dear Sir, your faithful humble

servant. X.Y.Z.

1. Mr. Hazlitt represents Mr. Malthus's error in regard to the

different ratios of progression as a _mathematical_ error; but the

other error he calls _logical_. This may seem to lead to nothing

important: it is however not for any purpose of verbal cavil that I

object to this distinction, and contend that both errors are logical.

For a little consideration will convince the reader that he, who

thinks the first error mathematical, will inevitably miss the true

point where the error of Mr. Malthus arises; and the consequence of

that will be--that he will never understand the Malthusians, nor ever

make himself understood by them. Mr. Hazlitt says, 'a bushel of wheat

will sow a whole field: the produce of that will sow twenty fields.'

Yes: but this is not the point which Mr. Malthus denies: this he will

willingly grant: neither will he deny that such a progression goes on

by geometrical ratios. If he did, then it is true that his error would

be a mathematical one. But all this he will concede. Where then lies

his error? Simply in this--that he assumes (I do not mean in words,

but it is manifestly latent in all that he says) that the wheat shall

be continually resown on the same area of land: he will not allow of

Mr. Hazlitt's 'twenty fields:' keep to your original field, he will

say. In this lies his error: and the nature of that error is--that he

insists upon shaping the case for the wheat in a way which makes it no

fair analogy to the case which he has shaped for man. That it is

unfair is evident: for Mr. Malthus does not mean to contend that his

men will go on by geometrical progression; or even by arithmetical,

upon the _same_ quantity of food: no! he will himself say the positive

principle of increase must concur with the same sort of increase in

the external (negative) condition, which is food. Upon what sort of

logic therefore does he demand that his wheat shall be thrown upon the

naked power of its positive principle, _not_ concurring with the same

sort of increase in the negative condition, which in this case is

land? It is true that at length we shall come to the end of the land,

because that is limited: but this has nothing to do with the race

between man and his food, so long as the race is possible. The race is

imagined for the sake of trying their several powers: and the terms of

the match must be made equal. But there is no equality in the terms as

they are supposed by Mr. Malthus. The amount therefore is--that the

case which Mr. Malthus everywhere supposes and reasons upon, is a case

of false analogy: that is, it is a logical error. But, setting aside

the unfairness of the case, Mr. Malthus is perfectly right in his

mathematics. If it were fair to demand that the wheat should be

constantly confined to the same space of land, it is undeniable that

it could never yield a produce advancing by a geometrical progression,

but at the utmost by a very slow arithmetical progression.

Consequently, taking the case as Mr. Malthus puts it, he is right in

calling it a case of arithmetical progression: and his error is in

putting that case as a logical counterpart to his other case.

2. Mr. Hazlitt says--'This, Mr. Editor, is the writer whom "our full

senate call all-in-all sufficient."'--And why not? I ask. Mr.

Hazlitt's inference is--that, because two propositions in Mr.

Malthus's Essay are overthrown, and because these two are propositions

to which Mr. Malthus ascribes a false importance, in relation to his

theory, therefore that theory is overthrown. But, if an architect,

under some fancied weakness of a bridge which is really strong and

self-supported, chooses to apply needless props, I shall not injure

the bridge by showing these to be rotten props and knocking them away.

What is the real strength and the real use of Mr. Malthus's theory of

population, cannot well be shown, except in treating of Political

Economy. But as to the influence of his logical errors upon that

theory, I contend that it is none at all. It is one error to affirm a

different law of increase for man and for his food: it is a second

error to affirm of a perfect state an attribute of imperfection: but

in my judgment it is a third error, as great as either of the others,

to suppose that these two errors can at all affect the Malthusian

doctrine of Population. Let Mr. Malthus say what he will, the first of

those errors is not the true foundation of that doctrine; the second

of those errors does not contain its true application.

The Uncollected Writings of Thomas de Quincey—Vol. 1 With a Preface and Annotations by James Hogg · 第 9 / 24 段