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sions on your time to be, what they really are, proofs of my great respect for you. I tolerate with the utmost latitude the right of others to differ from me in opinion, without imputing to them criminality. I know too well the weakness and uncertainty of human reason, to wonder at its different results. Both of our political parties, at least the honest part of them, agree conscientiously in the same object, the public good : but they differ essentially in what they deem the means of promoting that good. One side believes it best done by one composition of the governing powers; the other, by a different one. One fears most the ignorance of the people; the other, the selfishness of rulers independent of them. Which is right, time and experience will prove. We think that one side of this experiment has been long enough tried, and proved not to promote the good of the many : and that the other has not been fairly and sufficiently tried. Our opponents think the reverse. With whichever opinion the body of the nation concurs, that must prevail. My anxieties on this subject will never carry me beyond the use of fair and honorable means of truth and reason; nor have they ever lessened my esteem for moral worth, nor alienated my affections from a single friend, who did not first withdraw himself. Wherever this has happened, I confess I have not been insensible to it: yet have ever kept myself open to a return of their justice. I conclude with sincere prayers for your health and happiness, that yourself and Mr. Adams may long enjoy the tranquillity you desire and merit, and see in the prosperity of your family what is the consummation of the last and warmest of human wishes.




Washington, January 29, 1805. Dear Sir, Mr. Eppes has this moment put into my hands your letter of yesterday, asking information on the subject of the gun-boats proposed to be built. I lose no time in communicating to you fully my whole views respecting them, premising a few words on the system of fortifications. Considering the harbors which, from their

situation and importance, are entitled to defence, and the estimates we have seen of the fortifications planned for some of them, this system cannot be completed on a moderate scale for less than fifty millions of dollars, nor manned in time of war with less than fifty thousand men, and in peace, two thousand. And when done, they avail little ; because all military men agree, that wherever a vessel may pass a fort without tacking under her guns, which is the case at all our sea-port towns, she may be annoyed more or less, according to the advantages of the position, but can never be prevented. Our own experience during the war proved this on different occasions. Our predecessors have, nevertheless, proposed to go into this system, and had commenced it. But, no law requiring us to proceed, we have suspended it.

If we cannot hinder vessels from entering our harbors, we should turn our attention to the putting it out of their power to lie, or come to, before a town, to injure it. Two means of doing this may be adopted in aid of each other. 1. Heavy cannon on travelling carriages, which may be moved to any point on the bank or beach most convenient for dislodging the vessel. A sufficient number of these should be lent to each sea-port town, and their militia trained to them. The executive is authorized to do this; it has been done in a smaller degree, and will now be done more competently.

2. Having cannon on floating batteries or boats, which may be so stationed as to prevent a vessel entering the harbor, or force her after entering to depart. There are about fifteen harbors in the United States, which ought to be in a state of substantial defence. The whole of these would require, according to the best opinions, two hundred and forty gun-boats. Their cost was estimated by Captain Rogers at two thousand dollars each ; but we had better say four thousand dollars. The whole would cost one million of dollars. But we should allow ourselves ten years to complete it, unless circumstances should force it sooner. There are three situations in which the gun-boat may be. 1. Hauled up under a shed, in readiness to be launched and manned by the seamen and militia of the town on short notice. In this situation she costs nothing but an enclosure, or a centinel to see that no mischief is done to her. 2. Afloat, and with men enough to navigate her in harbor and take care of her, but depending on receiving her crew from the town on short warning. In this situation, her annual expense is about two thousand dollars, as by an official estimate at the end of this letter. 3. Fully manned for action. Her annual expense in this situation is about eight thousand dollars, as per estimate subjoined. When there is general peace, we should probably keep about six or seven afloat in the second situation; their annual expense twelve to fourteen thousand dollars; the rest all hauled up. When France and England are at war, we should keep, at the utmost, twenty-five in the second situation, their annual expense fifty thousand dollars. When we should be at war ourselves, some of them would probably be kept in the third situation, at an annual expense of eight thousand dollars; but how many, must depend on the circumstances of the war. We now possess ten, built and building. It is the opinion of those consulted, that fifteen more would enable us to put every harbor under our view into a respectable condition ; and that this should limit the views of the present year. This would require an appropriation of sixty thousand dollars, and I suppose that the best way of limiting it, without declaring the number, as perhaps that sum would build more. I should think it best not to give a detailed report, which exposes our policy too much. A bill, with verbal explanations, will suffice for the information of the House. I do not know whether General Wilkinson would approve the printing his paper. If he would, it would be useful. Accept affectionate and respectful salutations.




Washington, February 8, 1805. Dear Sir, Your letter of November the 26th came to hand May the 14th ; the books some time after, which were all distributed according to direction. The copy for the East Indies went immediately by a safe conveyance. The letter of April the 28th, and the copy of your work accompanying that, did not come to hand till August.

That copy was deposited in the Congressional library. It was not till my return here from my autumnal visit to Monticello, that I had an opportunity of reading your work. I have read it, and with great satisfaction. Of the first part I am less a judge than most people, having never travelled westward of Staunton, so as to know any thing of the face of the country; nor much indulged myself in geological inquiries, from a belief that the skin-deep scratches, which we can make or find on the surface of the earth, do not repay our time with as certain and useful deductions, as our pursuits in some other branches. The subject of our winds is more familiar to me. On that, the views you have taken are always great, supported in their outlines by your facts; and though more extensive observations, and longer continued, may produce some anomalies, yet they will probably take their place in this first great canvass which you have sketched. In no case, perhaps, does habit attach our choice or judgment more than in climate. The Canadian glows with delight in his sleigh and snow, the very idea of which gives me the shivers. The comparison of climate between Europe and North America, taking together its corresponding parts, hangs chiefly on three great points. 1. The changes between heat and cold in America are greater and more frequent, and the extremes comprehend a greater scale on the thermometer in America than in Europe. Habit, however, prevents these from affecting us more than the smaller changes of Europe affect the European. But he is greatly affected by ours. 2. Our sky is always clear ; that of Europe always cloudy. Hence a greater accumulation of heat here than there, in the same parallel. 3. The changes between wet and dry are much more frequent and sudden in Europe than in America. Though we have double the rain, it falls in half the time. Taking all these together, I prefer much the climate of the United States to that of Europe. I think it a more cheerful one. It is our cloudless sky which has eradicated from our constitutions all disposition to hang ourselves, which we might otherwise have inherited from our English ancestors. During a residence of between six and seven years in Paris, I never but once saw the sun shine through a whole day, without being obscured by a cloud in any part of it : and I never saw the moment, in which, viewing the sky through its whole hemisphere, I could say there was not the smallest speck of a cloud in it. I arrived at Monticello, on my return from France, in January, and during only two months' stay there, I observed to my daughters, who had been with me to France, that twenty odd times within that term, there was not a speck of a cloud in the whole hemisphere. Still I do not wonder that an European should prefer his grey to our azure sky. Habit decides our taste in this, as in most other cases.

The account you give of the yellow fever, is entirely agreeable to what we then knew of it. Further experience has developed more and more its peculiar character. Facts appear to have established, that it is originated here by a local atmosphere, which is never generated but in the lower, closer, and dirtier parts of our large cities, in the neighborhood of the water; and that, to catch the disease, you must enter the local atmosphere. Persons having taken the disease in the infected quarter, and going into the coun'try, are nursed and buried by their friends, without an example

of communicating it. A vessel going from the infected quarter, and carrying its atmosphere in its hold into another State, has given the disease to every person who there entered her. These have died in the arms of their families, without a single communication of the disease. It is certainly, therefore, an epidemic, not a contagious disease; and calls on the chemists for some mode of purifying the vessel by a decomposition of its atmosphere, if ventilation be found insufficient. In the long scale of bilious fevers, graduated by many shades, this is probably the last and most mortal term. It seizes the native of the place equally with strangers. It has not been long known in any part of the United States. The shade next above it, called the stranger's fever, has been coeval with the settlement of the larger cities in the southern parts, to wit, Norfolk, Charleston, New Orleans. Strangers going to these places in the months of July, August, or September, find this fever as mortal as the genuine yellow fever. But it rarely attacks those who have resided in them some time. Since we have known that kind of yellow fever, which is no respecter of persons, its name has been extended to the stranger's fever, and every species of bilious fever which produces a black vomit, that is to say, a discharge of very dark bile. Hence we hear of yellow fever on the Allegany mountains, in Kentucky, &c. This is a matter of definition only : but it leads into error those who do not know how loosely and how interestedly some physicians think and speak. So far as we have yet seen, I think we are correct in saying, that the yellow fever, which seizes on all indiscriminately, is an ultimate degree of bilious fever, never known in the United States till lately, nor farther south, as yet, than Alexandria, and that what they have recently called the yellow fever in New Orleans, Charleston, and Norfolk, is what has always been known in those places as confined chiefly to strangers, and nearly as mortal to them, as the other is to all its subjects. But both grades are local: the stranger's fever less so, as it sometimes extends a little into the neighborhood; but the yellow fever rigorously so, confined within narrow and well defined limits, and not communicable out of those limits. Such a constitution of atmosphere being requisite to originate this disease as is generated only in low, close, and ill-cleansed parts of a town, I have supposed it practicable to prevent its generation by building our cities on a more open plan. Take, for instance, the chequer-board for a plan. Let the black squares only be building squares, and the white ones be left open, in turf and trees. Every square of houses will be

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