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•es, are assaulted by wild beasts, murderers, and demons, and experience every variety of distress. Observe, however, that the quantities of food and exercise are relative things: those who move much may, and indeed ought to eat more; those who use little exercise should eat'little. In general, mankind, since' the improTement of cookery, eat about twice as tmuch as nature requires. Suppers are not bad, if we have not dined; but restless nights naturally follow hearty suppers, after full dinners. Indeed, as there is a difference in constitutions, some rest well after these meals; it costs them only a frightful dream. and an apoplexy, after which they sleep till doomsday. Nothing is more common in the newspapers, than instances of people, who, after eating a hearty supper, are found dead a.bed in the morning.

Another means of preserving health, to be attended to, is the havmg a cm., umt supply of fresh air in your bed.chamber. It has been a great mistake. the si epingin rooms exactly closed and m bids sunounded by curtains. No outward air that may come into you. is so unwhol..someas the unchanged an, often breathed, of a clo*e chamber. As bodmg water does not grow hotter b) longer boiling, if ihe panicles that receive greater heat can escape; so hvi g bodies do no put'ify, if the partii les,as fast as they become putrid. tan b.; thrown off. Nature ixpels them by the [lores of the Bkin and lungs, and in a fee open ai', they are carried' off; but, in a close room, we receive tium again and agaii, though they become more and more corrup.—. A number of persons crowded into a small room, Ljius spoil the air in a few minutes, and even render it moiv. t.il, as in the Black Hole at Calcutta. A smgle peisi;n is said to spoil only a gallon of air per minute, and therefore requires a longer time to spoil a chamber full; but it is done, ho.vever, in proportion, and many putrid disorders hence have their origin. It is recordee of Methusalem, who. being the longest liver, may be supposed to have best preserved his heulthi that nc skpt

always in the open air; for, when he had lived five huri* dred years, an angel said to him: ,' Arise, Methus;** lem; and build thee an house, for thou shall live yet five hundred years longer." But Methusalem answered and said: "If I am to live bur five hundred year* longer, it is not worth while to build ms an house—.l will sleep in the air as I have been used to do." Phy» sician3, after having for ages contended that the sick should not Be indulged with fresh air, have at length discoverd that it may do them good. It is therefore to bo hoped that it is not hurtful to those who are in health and that we may be then cured of the aerofihobiu that at present distresses weak minds, and makes them choose to be stilled and poisoned, rather than leave open the windows of a bed-chaniberj or put down the glass of a cone t).

Confined air, when saturated with perspirable matt !',* will not receive more; and that matter must remain in our bodies, and occasion diseases: hut it gives some previous noiice of Us being about to be hurtful, by piOuUiing certain uneasinesses blight.indeed at first, such as, with regard to ihe lungs, is a trifling sensation^ and to the pores of the skin a kind of restlessness which is difficult to describe, and few that feel it know the :catts. of it. but ve may recollect, that sometimes, on Wakmg m tile iti^ht, we have, if warmly covered, four.d it ciitViciiil to get asleep a.jain. We turn often without fiiHmig t' pose tn any position. This fidgetiness, to use u vulgai expression for want of a better, is occasioned wtioll) u' an uneasiness in the skin, owing to tlie retention of the perspirable matter—the bed clothes havmg received their quantity, and, being saturated, refusmg 10 take any mon...

To become sensible .f this by an experiment, let a per on keep his position in the bed, and throw off the

* What physicians cull the perspirable matter, is that vapour wh.ch passei, off fmmour bodies, from the lungs and through t! e pore» v.{ the sk.ii. The quantity of this is said to be five eighths of what we eat.

bed-clothes, and suffer fresh air to approach the. pari uncovered of his body; he will then fsel that pact Siku denly refreshed; for the air will immediately relieve the skin, by receiving, licking up, and carrying off, the load of perspirable matter that incommoded it. For every portion of cool air that approaches the warm skin, in receiving its part of that vajxiur, receives therewith a degree of heai, thut ratifies and rentiers it lighter, when it will be pushed away. with its burthen by coaler, and therefore heavier fresh air; which fur & moment, supplies its place, and then, being likewise changed, and warmed, gives way to a succeeding quantity. This is the order of nature, to prevent animals being infected by their own perspiration. He will now be sensible of the difference between the part exposed to the air, and that which, remaining sunk in the bed, denies. the air access: for this part now manifests its uneasiness more distinctly by the comparison, and the seat of the uneasiness is more plainly perceived, than when the whole surface of the body was affected by it.

.Here, then, is one great and general cause of unpleasing dreams. For when the body is uneasy, the mind: will be disturbed by it, and disagreeable ideas of various kiftds, will, in sleep, be the natural consequences* The remedies, preventative and curative, follow:

1. By ealingnwclerately (asbefore advised forhealth's sake) less. perspirable matter is pioduced in a given time; hence the bed.clothes receive it longer before t+>ey are saturated; and we may, therefore, sleep long'* «r, before we are made uneasy by their refusing to re<' ccive any more.

3. By using thinner and more porous "bed-clothes, which will suffer the perspirable matter more easily t» pass through them, we are less incommoded, such being longer tolerable.

3. When you are awakened by this uneasiness, and frnd you canno". easily sleep again, get out of bed, beat ttp aud turn you*. pillow, shake the bed clothes well» .with atlenst twentv shakes, then throw tTie bed ftpeH, and leave it to cool; in the meanwhile, continuing uiv drest, walk about your chambei, iill your skin has had time to discharge its load, which it will do sooner as the air may be drier and colder. When you begin to feel the cold air unpleasant, then return to your bvd; ai'd you will soon full asleep. and your sleep will be sweet and pleasant. All the scenes presented by your fancy, will be of the pleasing kind. 1 am often as agreeably entertained with them, as by the scenery of. an opera. If you happen to be too indolent to get out of bed, you may instead of it, lift up your bed-clothea with one arm and leg, soas to draw in a good deal of fresh air, and, by letting them f..ll, force it out again. This, repeatid twenty times, will bo clear them oi the perspirable matter they have imbibed, as to permit your sleeping well for sometime afterwards. Butthia latter method is not equal to the former.

Those who do not love trouble, and can afford t» have two beds. will find great luxury in rising, when they wake in a hotbed, and going into the cool one. Such shitting of beds, would also be of great service to persons ill in a fever; as it refreshes and frequently procures sleep. A very large bed, that will admit a removal so distant from the first situation as to be cool and sweet, may in a degree answer the same end.

One or two observations more will conclude th'S little piece. Care must be taken, when you lie down, to dispose your pillow so as to suit your manner of placing your head, and to be perfectly easy ; then place your limbs so as not to bear inconveniently hard upoa <5ne another, as for instance, the joints of your ancles: for though a bad position may at. first give but little pain, and be hardly noticed, yet a continuance will rentier it less tolerable, and the uneasiness may come on. while you r.re asleep, and disturb your imagination.

These are the rules of the art. But though they will.generally prove effectual .in producing the end intended, there is a case in which the most punctual ob* servance of them will be totally fruii few. T need not mention the cose to you, my dear friend: but my account of the art would be imperfect without it. The case is. when the person who desires to have pleasant dreams has not taken care to preserve, what is neces* sary above all things, A GOOD CONSCIENCE.

ADVICE TO A YOUNG TRADESMAN".

WRITTFN ANNO 1748, TO MY FRIEND A. B.

As you have desired it of me, I write the following hintst •which have been of'service to me, and may, if observed be so to you.

Remember that time is money. He that can earn ten shillings a day by his labour, and goes abroad, or sits idle one half of that day, though he spends but sixpence during his diversion or idleness,, ought not to reckon that the only expence ; he has really spent, or rather thrown away five shillings besides.

Remember that credit is money. If a man lets hi» money lie in my hands after it is due, he gives me the interest, or so iiiuch as I can make of it during that time. This amounts to a considerable sum where a, man has good and large credit, and makes good use; •fit.

Remember that money is of a prolific generating nature. Money can beget money, and its offspring can beget more, and so on. Five shillings turned is six f turned again, it is seven and three pence; and so onv till it becomes an hundred pounds. The more there ia of it, the more it produces, every turning, so that the profits rise quicker and quicker. He that kills a breeding sow, destroys all her offspring to the thousandth generation. He that murders a crown, destroys all that it might have produced, even scores of pounds.

Remember that six pounds a year is but a groat a day» For this little sum, which may be daily wasted either

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