I lay down, then, as a positive rule of health, that the warmest dishes the natives delight in, are the most wholesome strangers can use in the putrid climates of the Lower Arabia, Abyssinia, Sennaar, and Egypt itself; and that spirits, and all fermented liquors, should be regarded as poisons, and, for fear of temptation, not so much as be carried along with you, unless as a menstruum for outward applications. Spring, or running water, if you can find it, is to be your only drink. You cannot be too nice in procuring this article. But as, on both coasts of the Red Sea you scarcely find any but stagnant water, the way I practised was always this, when I was at any place that allowed me time and opportunity--I took a quantity of fine sand, washed it from the salt quality with which it was impregnated, and spread it upon a sheet to dry; I then filled an oil-jar with water, and poured into it as much from a boiling kettle as would serve to kill all the animalcula and eggs that were in it. I then sifted my dried sand, as slowly as possible, upon the surface of the water in the jar, till the sand stood half a foot in the bottom of it; after letting it settle a night, we drew it off by a hole in the jar with a spigot in it, about an inch above the sand; then threw the remaining sand out upon the cloth, and dried and washed it again. This process is sooner performed than described. The water is as limpid as the purest spring, and little inferior to the finest Spa. Drink largely of this without fear, according as your appetite requires. By violent perspiration the aqueous part of your blood is thrown off; and it is not spiritous liquor can restore this, whatever momentary strength it may give you from another cause. When hot, and almost fainting with weakness from continual perspiration, I have gone into a warm bath, and been immediately restored to strength, as upon first rising in the morning. Some perhaps will object, that this heat should have weakened and overpowered you; but the fact is otherwise; and the reason is, the quantity of water, taken up by your absorbing vessels, restored to your blood that finer fluid which was thrown off, and then the uneasiness occasioned by that want ceased, for it was the want of that we called uneasiness.