TO M. DU RIVAL
Sir,—I am honored with your letter of the 1st instant, enclosing inquiries on the subject of the coins of the United States. Some time during the last year, Congress decided that the Spanish milled dollar should be their money unit, and that their coins should be in a decimal progression above or below that. Some intermediate coins will also be doubtless made for convenience, and indeed they determined that their smallest copper coin should be the two-hundredth part of a dollar. They did not determine how much pure silver their money unit should contain, nor establish the proportion between their silver and gold coins. No other resolutions were entered into, nor had anything been done to effectuate these. What is said, therefore, on this subject in the Courier d'Europe is entirely fable, unless the compiler of that paper has received information of a later date than the middle of August. I do expect that Congress will sometime soon complete their system or resolutions on this subject, and carry them into effect.
I have the honor to be, with sentiment of the highest respect, Sir, your most obedient, and most humble servant.
P. S. I omitted to observe that most of the gold and silver coins of Europe pass in the several States of America according to the quantity of pure metal they contain.
TO M. FAMIN
Sir,—This will be handed you by Colonel Blackden, heretofore an officer in the American army—at present engaged in trade. He goes to Honfleur with a view to examine the commercial relations which may be established between that port and the United States. He wishes particularly to see the nature of its harbor, the conveniences already established for commerce, and to know something of the productions which can be taken and given there in exchange. Knowing your desire to assist in drawing the American commerce to that port, I take the liberty of recommending this gentleman to your acquaintance, and of praying you to procure him the information he desires.
Some late regulations of the King and Council in favor of the commerce of the United States having given us room to hope that our endeavors may be successful to remove a good part of it from Great Britain to France, Honfleur presents itself as a more important instrument for this purpose than it had heretofore appeared. We are, therefore, now pressing more earnestly its establishment as a free port, and such other regulations in its favor as may invite the commerce to it.
I have the honor to be, Sir, your most obedient, and most humble servant.
TO THE HONORABLE MR. JAY
Sir,—In a letter which I had the honor of writing you on the 26th of September, I informed you that a Dutch company were making propositions to the Minister of Finance here to purchase at a discount, the debt due from the United States to this country. I have lately procured a copy of their memoir which I now enclose. Should Congress think this subject worthy their attention, they have no time to lose, as the necessities of the minister, which alone has made him listen to this proposition, may force him to a speedy conclusion. The effect which a payment of the whole sum would have here, would be very valuable. The only question is, whether we can borrow it in Holland, a question which cannot be resolved but in Holland. The trouble of the trial, and the expense of the transaction, would be well repaid by the dispositions which would be excited in our favor in the King and his ministers. I have the honor to be, with sentiments of the most perfect esteem and respect, Sir, your most obedient, and most humble servant.
M. LE ROY DE L'ACADEMIE DES SCIENCES
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 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 north-westerly breeze is, for the most part, felt there, while an easterly or north-easterly 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 36½ 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