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my chamber without any clothes whatever, half an hour or an hour, according to the season, either reading or writing. This practice is not in the least painful, but, on ihe contrary, agreeable ; and if I return to bed afterwards, before I dress myself, as sometimes happens, I make a supplement to my night's rest of one or two hours of the most pleasing sleep'that can be imagined. I find no ill consequences whatever resulting from it, and that at least it does not injure my health, if it does not in fact contribute much to its preservation. I shall therefore call it for the future a bracing or tonic bath,

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- March 10, 1-73., "I shall not attempt to explain why damp clothes occasion colds, rather than wet ones, because I doubt the fact : I imagine that neither the one nor the other contribute to this effect, and that the causes of colds are totally independent of wet and even of cold. I propose writing a short paper on this subject, the first leisure moment I have at my disposal. In the mean time I can only say, that having some fufpicions that the common notion, which attributes to cold the property of stopping the pores and obstructing perspiration, was illa founded, I engaged a young physician, who is making fome experiments with Sanctorius's balance, to estimate the different proportions of his perfpiration, when remaining one hour quite naked, and another warmly clothed. He pursued the expę. timent in this alternate manner for eight hours successively, and found his perfpiration almost double during those hours in which he was nakeda

OBSERVATIONS ON THE GENERALLY PREVAILING DOC2. TRINES OF LIFE AND DEATH,

TO THE SAME.

TOUR obfervations on the causes of death,

and the experiments which you propose for "iccalling to life thiole who appear to be ki led by

lightning, demonstrate equally your fagacity and humanity. It appears that the doctrines of life and death, in general, are yet but little understood.

A coad, buried in fand, will live, it is said, un, ül the sand becomes petrified ; and then, being inclosed in the stone, it may till live for we know pot how many ages. The facts which are cited in

support of this opinion, are ioo numerous and too E circunstantial nut to deferve a certain degree of e credit. As we are accustomed to see all the ani

mals with which we are acquainted cat and drink, ito appears to us dillicult to conceive how à toad can be supported in such a dlungeon. But if we reflect, ihat the neceffity of nourishment, which animals experience in their ordinary state, proceeds

froin the c inunual waste of their substance by per- fpiration : it will appear less incredible that lome

animals in a torpid state, perspiring less because they use no exercise, thould have less need of aliment; and that others, which are covered wiih scales or thells, which stop perfpiration, such as land and lea turtles, serpents, and some species of fish, should be able co fubfit à considerable time without any nourishment whatever. A plant, with its flowers, fades and dies immediately, if exposed to the air without having its roots immersed in a humid soil, froin which it may draw a sufficient quantity of moitlure, to supply that which exhales from its fubftance, and is carried off continually by the air. Perhaps, however, if it were buried in quickálver, it might preserve, for a confiderable space of tiine, its vegetable life, its finell and colour. If this be the case, it might prove a commodious method of transporting from distant couintries those delicate plants which are unable to suftain the inclemency of the weather at fea, and which require particular care and attention.

I have seen an instance of common flies preserve ed in a inanner fomewhat similar. They had been drowicd in Madcira wine, apparently about the time when it was bottled in Virginia, to be sent to London. At the opening of one of the bottles, at the house of a friend where I was, three drowned flies fell into the firit glass which was filled. Having heard it remarked that drowned flies w re capable of bein; revived by the rays of the fung I propofed making the experiment upon thefe. They were therefore exposed to the sun, upon a lieve, which had been employed to train them. out of the wine. In less than three hours two of them began by degrees to recover life. They cominenced by some convulsive motions in the thighs, and at length they raised themselves upon their legs, wiped their eyes with their fore feet, beat and brushed their wings with their bind feet; and soon after began to fly, finding themselves in Old England, without knowing how they came thither. The third continued lifeless until sunset,

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. . 63 when, lofing all hopes of him, he was thrown as way, 4

I wish it were possible, from this instance, to inyent a method' of embalming drowned persons, în fuch a manner that 'they might be recalled to life at any period, however distant; for having a yery ardent desire to see and observe the state of America an hundred years hence, I should prefer to an ordinary death, the being immersed in a calk of Madeira wine, with a few friends, until that time, then to be recalled to life by the solar warmth of my dear country. But, fince, in all probability, we live in an age too early, and too near the infancy of fcience, to see such an art brought in onr time to its perfection, I must, for the present, content myself with the treat, which you are so kind as to promise me, of the resurrece Hun of a fowl or a turkey-cock. ... .

PRECAUTIONS to be used by those who are about to Cen .. underinke i SEA VOYAGE.

THEN you intend to take a long voyage V nothing is better than to keep it a secret till the moment of your departure. Without this, you will be continually interrupted and torinenced by vifits from friends and acquaintances, who not oniy make you lose your valuable time, but make You forget a thousand things which you wish to Lemember; so that when you are embarked, and

fairly at fea, you recollect, with much uneasiness; affairs which you have not terminated, accounts which you have not settled, and a number of things which you proposed to carry with you, and which you find the want of every moment. Would it not be attended with the best consequences, to reforin such a custom; and suffer a traveller, with. ouit deranging him, to make his preparations in quietness, to fet apart a few days, when these are finished, to take leave of his friends, and to receive their good wishes for his happy return?

It is not always in one's power to choose a captain; though great part of the pleafure and happi. ness of the paffage depends upon this choice, and tho' one inust for a time be confined to his company, and be in fome measure under his command. If he is a social sensible man, obliging, and of a good difpofition, you will be so much the happier. One sometimes meets with people of this description, but they are not common; however, if yours be not of this number, if he be a good seaman, attentive, careful, and active in the management of his vehel, you may difpenfe with the reit, for these are the most effential qualities. ' · Whatever right you may have, by your agreement with him, to the provisions he has taken on board for the use of the passengers, it is always proper to have fonie private store, which you may make use of occasionally. You ought, therefore, to provide good water, that of the thip being often bad; but you must put it into bottles, without whic! you cannot expect to preserve it sweet. You ought also to carry' with you good tea, ground cailee, chocolate, wine of the fort you like beft, cyder, jried raisins, almonds, fugar, capillaire, citrons, um, eggs dipped in oil, portable soup, bread twice

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