Head. I did not begin this lecture, my friend, with a view to learn from

you what America is doing. Let us return, then, to our point. I wish to

make you sensible how imprudent it is to place your affections without

reserve on objects you must so soon lose, and whose loss, when it comes,

must cost you such severe pangs. Remember the last night. You knew your

friends were to leave Paris to-day. This was enough to throw you into

agonies. All night you tossed us from one side of the bed to the other;

no sleep, no rest. The poor Crippled wrist, too, never left one moment

in the same position; now up, now down, now here, now there; was it

to be wondered at, if its pains returned? The surgeon then was to be

called, and to be rated as an ignoramus, because he could not divine the

cause of this extraordinary change. In fine, my friend, you must mend

your manners. This is not a world to live at random in, as you do. To

avoid those eternal distresses, to which you are for ever exposing

us, you must learn to look forward before you take a step, which may

interest our peace. Every thing in this world is matter of calculation.

Advance, then, with caution, the balance in your hand. Put into one

scale the pleasures which any object may offer; but put fairly into the

other the pains which are to follow, and see which preponderates. The

making an acquaintance is not a matter of indifference. When a new

one is proposed to you, view it all round. Consider what advantages it

presents, and to what inconveniences it may expose you. Do not bite at

the bait of pleasure, till you know there is no hook beneath it. The

art of life is the art of avoiding pain; and he is the best pilot, who

steers clearest of the rocks and shoals with which it is beset. Pleasure

is always before us; but misfortune is at our side: while running after

that, this arrests us. The most effectual means of being secure

against pain, is to retire within ourselves, and to suffice for our own

happiness. Those which depend on ourselves, are the only pleasures a

wise man will count on; for nothing is ours, which another may deprive

us of. Hence the inestimable value of intellectual pleasures. Ever in

our power, always leading us to something new, never cloying, we

ride serene and sublime above the concerns of this mortal world,

contemplating truth and nature, matter and motion, the laws which bind

up their existence, and that Eternal Being, who made and bound them up

by those laws. Let this be our employ. Leave the bustle and tumult of

society to those who have not talents to occupy themselves without them.

Friendship is but another name for an alliance with the follies and

the misfortunes of others. Our own share of miseries is sufficient: why

enter then as volunteers into those of another? Is there so little

gall poured into our cup, that we must heed help to drink that of our

neighbor? A friend dies, or leaves us: we feel as if a limb was cut off.

He is sick: we must watch over him, and participate of his pains. His

fortune is shipwrecked: ours must be laid under contribution. He loses a

child, a parent, or a partner: we must mourn the loss as if it were our

own.

Heart. And what more sublime delight, than to mingle tears with one whom

the hand of Heaven hath smitten! to watch over the bed of sickness, and

to beguile its tedious and its painful moments! to share our bread with

one to whom misfortune has left none! This world abounds indeed with

misery: to lighten its burthen, we must divide it with one another. But

let us now try the virtue of your mathematical balance, and as you have

put into one scale the burthens of friendship, let me put its comforts

into the other. When languishing then under disease, how grateful is the

solace of our friends! how are we penetrated with their assiduities and

attentions! how much are we supported by their encouragements and kind

offices! When Heaven has taken from us some object of our love, how

sweet is it to have a bosom whereon to recline our heads, and into which

we may pour the torrent of our tears! Grief, with such a comfort, is

almost a luxury! In a life where we are perpetually exposed to want and

accident, yours is a wonderful proposition, to insulate ourselves,

to retire from all aid, and to wrap ourselves in the mantle of

self-sufficiency! For assuredly nobody will care for him, who cares for

nobody. But friendship is precious, not only in the shade, but in the

sunshine of life: and thanks to a benevolent arrangement of things, the

greater part of life is sunshine. I will recur for proof to the days we

have lately passed. On these, indeed, the sun shone brightly! How

gay did the face of nature appear! Hills, valleys, chateaux, gardens,

rivers, every object wore its liveliest hue! Whence did they borrow it?

From the presence of our charming companion. They were pleasing, because

she seemed pleased. Alone, the scene would have been dull and insipid:

the participation of it with her gave it relish. Let the gloomy monk,

sequestered from the world, seek unsocial pleasures in the bottom of his

cell! Let the sublimated philosopher grasp visionary happiness, while

pursuing phantoms dressed in the garb of truth! Their supreme wisdom is

supreme folly: and they mistake for happiness the mere absence of pain.

Had they ever felt the solid pleasure of one generous spasm of the

heart, they would exchange for it all the frigid speculations of their

lives, which you have been vaunting in such elevated terms. Believe

me, then, my friend, that that is a miserable arithmetic, which could

estimate friendship at nothing, or at less than nothing. Respect for

you has induced me to enter into this discussion, and to hear principles

uttered, which I detest and abjure. Respect for myself now obliges me to

recall you into the proper limits of your office. When nature assigned

us the same habitation, she gave us over it a divided empire. To you she

allotted the field of science; to me that of morals.

When the circle is to be squared, or the orbit of a comet to be traced;

when the arch of greatest strength, or the solid of least resistance is

to be investigated, take up the problem; it is yours; nature has given

me no cognizance of it. In like manner, in denying to you the feelings

of sympathy, of benevolence, of gratitude, of justice, of love, of

friendship, she has excluded you from their control. To these she has

adapted the mechanism of the heart. Morals were too essential to the

happiness of man, to be risked on the uncertain combinations of the

head. She laid their foundation, therefore, in sentiment, not in

science. That she gave to all, as necessary to all: this to a few only,

as sufficing with a few. I know indeed, that you pretend authority to

the sovereign control of our conduct, in all its parts: and a respect

for your grave saws and maxims, a desire to do what is right, has

sometimes induced me to conform to your counsels. A few facts, however,

which I can readily recall to your memory, will suffice to prove to you,

that nature has not organized you for our moral direction. When the poor

wearied soldier, whom we overtook at Chickahominy, with his pack on

his back, begged us to let him get up behind our chariot, you began to

calculate that the road was full of soldiers, and that if all should be

taken up, our horses would fail in their journey. We drove on therefore.

But soon becoming sensible you had made me do wrong, that though we

cannot relieve all the distressed, we should relieve as many as we can,

I turned about to take up the soldier; but he had entered a by-path,

and was no more to be found: and from that moment to this, I could never

find him out to ask his forgiveness. Again, when the poor woman came

to ask a charity in Philadelphia, you whispered, that she looked like

a drunkard, and that half a dollar was enough to give her for the

ale-house. Those who want the dispositions to give, easily find reasons

why they ought not to give. When I sought her out afterwards, and did

what I should have done at first, you know, that she employed the money

immediately towards placing her child at school. If our country, when

pressed with wrongs at the point of the bayonet, had been governed by

its heads instead of its’ hearts, where should we have been now? Hanging

on a gallows as high as Hainan’s. You began to calculate, and to compare

wealth and numbers: we threw up a few pulsations of our blood; we

supplied enthusiasm against wealth and numbers; we put our existence to

the hazard, when the hazard seemed against us, and we saved our country:

justifying, at the same time, the ways of Providence, whose precept is,

to do always what is right, and leave the issue to him. In short, my

friend, as far as my recollection serves me, I do not know that I ever

did a good thing on your suggestion, or a dirty one without it. I do for

ever, then, disclaim your interference in my province. Fill paper as you

please with triangles and squares: try how many ways you can hang and

combine them together. I shall never envy nor control your sublime

delights. But leave me to decide when and where friendships are to be

contracted. You say I contract them at random. So you said the woman at

Philadelphia was a drunkard. I receive none into my esteem, till I know

they are worthy of it. Wealth, title, office, are no recommendations to

my friendship. On the contrary, great good qualities are requisite to

make amends for their having wealth, title, and office. You confess,

that, in the present case, I could not have made a worthier choice.

You only object, that I was so soon to lose them. We are not immortal

ourselves, my friend; how can we expect our enjoyments to be so? We have

no rose without its thorn; no pleasure without alloy. It is the law of

our existence; and we must acquiesce. It is the condition annexed to all

our pleasures, not by us who receive, but by him who gives them. True,

this condition is pressing cruelly on me at this moment. I feel more fit

for death than life. But when I look back on the pleasures of which

it is the consequence, I am conscious they were worth the price I am

paying. Notwithstanding your endeavors, too, to damp my hopes, I comfort

myself with expectations of their promised return. Hope is sweeter than

despair; and they were too good to mean to deceive me. ‘In the summer,’

said the gentleman; but ‘In the spring,’ said the lady; and I should

love her for ever, were it only for that! Know, then, my friend, that I

have taken these good people into my bosom; that I have lodged them in

the warmest cell I could find; that I love them, and will continue to

love them through life; that if fortune should dispose them on one side

the globe, and me on the other, my affections shall pervade its whole

mass to reach them. Knowing then my determination, attempt not to

disturb it. If you can at any time furnish matter for their amusement,

it will be the office of a good neighbor to do it. I will, in like

manner, seize any occasion which may offer, to do the like good turn for

you with Condorcet, Rittenhouse, Madison, La Cretelle, or any other of

those worthy sons of science, whom you so justly prize.

I thought this a favorable proposition whereon to rest the issue of the

dialogue. So I put an end to it by calling for my nightcap. Methinks, I

hear you wish to Heaven I had called a little sooner, and so spared you

the _ennui_ of such a sermon. I did not interrupt them sooner, because

I was in a mood for hearing sermons. You, too, were the subject; and on

such a thesis, I never think the theme long; not even if I am to write

it, and that slowly and awkwardly, as now, with the left hand. But

that you may not be discouraged from a correspondence, which begins

so formidably, I will promise you, on my honor, that my future letters

shall be of a reasonable length. I will even agree to express but half

my esteem for you, for fear of cloying you with too full a dose. But on

your part, no curtailing. If your letters are as long as the Bible,

they will appear short to me. Only let them be brim full of affection. I

shall read them with the dispositions with which Arlequin, in _Les

Deux Billets_, spelt the words ‘_Je t’aime,_’ and wished that the whole

alphabet had entered into their composition.

We have had incessant rains since your departure. These make me fear for

your health, as well as that you had an uncomfortable journey. The same

cause has prevented me from being able to give you any account of your

friends here. This voyage to Fontainebleau will probably send the Count

de Moutier and the Marquis de Brehan to America. Danquerville promised

to visit me, but has not done it as yet. De la Tude comes sometimes to

take family soup with me, and entertains me with anecdotes of his five

and thirty years’ imprisonment. How fertile is the mind of man, which

can make the Bastille and dungeon of Vincennes yield interesting

anecdotes! You know this was for making four verses on Madame de

Pompadour. But I think you told me you did not know the verses. They

were these.

‘Sans esprit, sans sentiment,

Sans etre belle, ni neuve,

En France on peut avoir le premier amant:

Pompadour en est Tepreuve.’

I have read the memoir of his three escapes. As to myself, my health is

good, except my wrist, which mends slowly, and my mind, which mends not

at all, but broods constantly over your departure. The lateness of

the season obliges me to decline my journey into the south of France.

Present me in the most friendly terms to Mr. Cosway, and receive me into

your own recollection with a partiality and warmth, proportioned not

to my own poor merit, but to the sentiments of sincere affection and

esteem, with which I have the honor to be, my Dear Madam,

Your most obedient, humble servant,

Th: Jefferson.

LETTER XXIX.--TO MRS. COSWAY, October 13, 1786

TO MRS. COSWAY.

Paris, October 13, 1786.

My Dear Madam,

Just as I had sealed the enclosed, I received a letter of a good length,

dated Antwerp, with your name at the bottom. I prepared myself for a

feast. I read two or three sentences: looked again at the signature, to

see if I had not mistaken it. It was visibly yours. Read a sentence or

two more. Diable! Spelt your name distinctly. There was not a letter of

it omitted. Began to read again. In fine, after reading a little, and

examining the signature alternately, half a dozen times, I found that

your name was to four lines only, instead of four pages. I thank you

for the four lines, however, because they prove you think of me; little,

indeed, but better little than none. To show how much I think of you, I

send you the enclosed letter of three sheets of paper, being a history

of the evening I parted with you. But how expect you should read a

letter of three mortal sheets of paper? I will tell you. Divide it into

six doses of half a sheet each, and every day, when the toilette begins,

take a dose, that is to say, read half a sheet. By this means, it

will have the only merit its length and dulness can aspire to, that of

assisting your coiffeuse to procure you six good naps of sleep. I will

even allow you twelve days to get through it, holding you rigorously to

one condition only, that is, that at whatever hour you receive this, you

do not break the seal of the enclosed till the next toilette. Of this

injunction I require a sacred execution. I rest it on your friendship,

and that in your first letter, you tell me honestly, whether you have

honestly performed it. I send you the song I promised. Bring me in

return the subject, _Jours heureux!_ Were I a songster, I should sing it

all to these words; ‘_Dans ces lieux qu’elle tarde à se rendre!_’ Learn

it, I pray you, and sing it with feeling. My right hand presents its

devoirs to you, and sees with great indignation the left supplanting it

in a correspondence so much valued. You will know the first moment it

can resume its rights. The first exercise of them shall be addressed to

you, as you had the first essay of its rival. It will yet, however, be

many a day. Present my esteem to Mr. Cosway, and believe me to be yours

very affectionately,

Th: Jefferson.

LETTER XXX.--M. LE ROY DE L’ACADEMIE DES SCIENCES, November 13, 1786

M. LE ROY DE L’ACADEMIE DES SCIENCES.

Paris, November 13, 1786.

Sir,

I received the honor of yours of September the 18th, a day or two after

the accident of a dislocated wrist had disabled me from writing. I have

waited thus long in constant hope of recovering its use. But finding

that this hope walks before me like my shadow, I can no longer oppose

the desire and duty of answering your polite and learned letter. I

therefore employ my left hand in the office of scribe, which it performs

indeed slowly, awkwardly, and badly.

The information given by me to the Marquis de Chastellux, and alluded to

in his book and in your letter, was, that the sea breezes which prevail

in the lower parts of Virginia, during the summer months, and in the

warm parts of-the day, had made a sensible progress into the interior

country: that formerly, within the memory of persons living, they

extended but little above Williamsburg; that afterwards they became

sensible as high as Richmond; and that, at present, they penetrate

sometimes as far as the first mountains, which are above an hundred

miles further from the sea coast, than Williamsburg is. It is very rare,

indeed, that they reach those mountains, and not till the afternoon is

considerably advanced. A light northwesterly breeze is, for the most

part, felt there, while an easterly or northeasterly wind is blowing

strongly in the lower country. How far northward and southward of

Virginia, this easterly breeze Takes place, I am not informed. I must,

therefore, be understood as speaking of that State only, which extends

on the sea coast from 36 1/2 to 38° of latitude.

This is the fact. We know too little of the operations of nature in the

physical world, to assign causes with any degree of confidence. Willing

always, however, to guess at what we do not know, I have sometimes

indulged myself with conjectures on the causes of the phenomena above

stated. I will hazard them on paper, for your amusement, premising for

their foundation some principles believed to be true.

Air resting on a heated and reflecting surface, becomes warmer, rarer,

and lighter: it ascends therefore, and the circumjacent air, which is

colder and heavier, flows into its place, becomes warmed and lightened

in its turn, ascends, and is succeeded as that which went before. If the

heated surface be circular, the air flows to it from every quarter,

like the rays of a circle to its centre. If it be a zone of determinate

breadth and indefinite length, the air will flow from each side

perpendicularly on it. If the currents of air flowing from opposite

sides, be of equal force, they will meet in equilibrio, at a line

drawn longitudinally through the middle of the zone. If one current be

stronger than the other, the stronger one will force back the line of

equilibrium, towards the further edge of the zone, or even beyond it:

the motion it has acquired causing it to overshoot the zone, as the

motion acquired by a pendulum in its descent, causes it to vibrate

beyond the point of its lowest descent.

Earth, exposed naked to the sun’s rays, absorbs a good portion of them;

but, being an opaque body, those rays penetrate to a small depth only.

Its surface, by this accumulation of absorbed rays, becomes considerably

heated. The residue of the rays are reflected into the air resting on

that surface. This air, then, is warmed, 1. by the direct rays of the

sun; 2. by its reflected rays; 3. by contact with the heated surface.

A forest receiving the sun’s rays, a part of them enters the intervals

between the trees, and their reflection upwards is intercepted by the

leaves and boughs. The rest fall on the trees, the leaves of which being

generally inclined towards the horizon, reflect the rays downwards. The

atmosphere here, then, receives little or no heat by reflection. Again,

these leaves having a power of keeping themselves cool by their own

transpiration, they impart no heat to the air by contact. Reflection

and contact, then, two of the three modes before-mentioned, of

communicating heat, are wanting here; and, of course, the air over

a country covered by forest must be colder than that over cultivated

grounds.

The sea being pellucid, the sun’s rays penetrate it to a considerable

depth. Being also fluid, and in perpetual agitation, its parts are

constantly mixed together; so that instead of its heat being all

accumulated in its surface, as in the case of a solid, opaque body,

it is diffused through its whole mass. Its surface, therefore, is

comparatively cool, for these reasons; to which may be added that of

evaporation. The small degree of reflection which might otherwise take

place, is generally prevented by the rippled state of its surface. The

air resting on the sea, then, like that resting on a forest, receives

little or no heat by reflection or contact; and is therefore colder than

that which lies over a cultivated country.

To apply these observations to the phenomena under consideration. The

first settlements of Virginia were made along the sea coast, bearing

from the south, towards the north, a little eastwardly. These

settlements formed a zone, in which, though every point was not cleared

of its forest, yet a good proportion was cleared and cultivated. The

cultivated earth, as the sun advances above the horizon in the morning,

acquires from it an intense heat, which is retained and increased

through the warm parts of the day. The air resting on it becomes warm

in proportion, and rises. On one side is a country still covered with

forest: on the other is the ocean. The colder air from both of these,

then rushes towards the heated zone, to supply the place left vacant

there by the ascent of its warm air. The breeze from the west is light

and feeble; because it traverses a country covered with mountains and

forests, which retard its current. That from the east is strong; as

passing over the ocean, wherein there is no obstacle to its motion.

It is probable, therefore, that this easterly breeze forces itself far

into, or perhaps beyond, the zone which produces it. This zone is,

by the increase of population, continually widening into the interior

country. The line of equilibrium between the easterly and westerly

breezes is, therefore, progressive.

Did no foreign causes intervene, the sea breezes would be a little

southwardly of the east, that direction being perpendicular to our

coast. But within the tropics, there are winds which blow continually

and strongly from the east. This current affects the course of the air,

even without the tropics. The same cause, too, which produces a strong

motion of the air, from east to west, between the tropics, to wit, the

sun, exercises its influence without those limits, but more feebly, in

proportion as the surface of the globe is there more obliquely presented

to its rays. This effect, though not great, is not to be neglected when

the sun is in or near our summer solstice, which is the season of these

easterly breezes. The northern air, too, flowing towards the equatorial

parts, to supply the vacuum made there by the ascent of their heated

air, has only the small rotary motion of the polar latitudes from which

it comes. Nor does it suddenly acquire the swifter rotation of the parts

into which it enters. This gives it the effect of a motion opposed to

that of the earth, that is to say, of an easterly one. And all these

causes together are known to produce currents of air in the Atlantic,

varying from east to northeast, as far as the fortieth degree of

latitude. It is this current which presses our sea breeze out of its

natural southeasterly direction, to an easterly, and sometimes almost a

northeasterly one.

Memoir, Correspondence, and Miscellanies, From the Papers of Thomas Jefferson, Volume 2 · 第 5 / 50 段