This lecture of Dr. Warren is printed in a form suitable for popular distribution, while the high reputation of its author insures it respect. Readers will expect to find here those rules for daily practice taught by that plain common-sense which men possess from nature, but strangely lose sight of, amid their many inventions, and are obliged to rediscover by aid of experience and science. Here will be found those general statements as to modes of exercise, care of the skin, choice of food, and time, and circumstances required for its digestion, which might furnish the ounce of prevention that is worth so many pounds of cure. And how much are these needed in this country, where the most barbarous ignorance prevails on the subject of cleanliness, sleeping accommodations, &c.! On these subjects improvement would be easy; that of diet is far more complicated, and is, unfortunately, one which requires great knowledge of the ways in which the human frame is affected by the changes of climate and various other influences, even wisely to discuss. If it is difficult where a race, mostly indigenous to the soil, feed upon what Mother Nature has prepared expressly for their use, and where excess or want of judgment in its use produces disease, it must be far more so where men come from all latitudes to live under new circumstances, and need a judicious adaptation of the old to the new. The dogmatism and proscription that prevail on this topic amuse the observer and distress the patient. "Touch no meat for your life," says one. "It is not meat, but sugar, that is your ruin," cries another. "No, salt is the destruction of the world," sadly and gravely declares a third. Milk, which once conciliated all regards, has its denunciators. "Water," say some, "is the bliss that shall dissolve all bane. Drink; wash--take to yourself all the water you can get." "That is madness--is far worse than useless," cry others, "unless the water be pure. You must touch none that has not been tested by a chemist." "Yes, you may at any rate drink it," say others, "and in large quantities, for the power of water to aid digestion is obvious to every observer." "No," says Dr. Warren, "animals do not drink at the time they eat, but some hours after; and they generally take very small quantities of liquid, compared with that which is used by man. The savage, in his native wilds, takes his solid food, when he can obtain it, to satiety, reposes afterwards, and then resuming his chase through the forest, stops at the rivulet to allay his thirst. The disadvantage of taking a large quantity of liquid must be obvious to all those who consider that the digesting liquid is diluted and weakened in proportion to the quantity of drink."