The Author of Nature has so constructed our organs of digestion, that we can accommodate ourselves to every species of aliment; no kind of food injures us; we are capable of being habituated to every species, and of converting into nutriment almost every production of nature. When we enquire more minutely into the chemical constitution of the different alimentary materials, which promote the growth, support the strength, and renew the waste of our body, we find that animal substances are not suited to form the whole of our daily food; and that, in fact, if long and extensively used, their stimulating effects at length exhausts and debilitates the system, which it at first invigorated and supported. Those, accordingly, who have lived for any great length of time on a diet composed entirely of animal matter, become oppressed, heavy, and indolent, the tone and excitability of their frame are impaired, they are affected with indigestion, the breathing is hurried on the smallest exercise, the gums become spongy, the breath is fœtid, and the limbs swell. We recognize in this description the approach of scurvy, a disease familiar to sailors, to the inhabitants of besieged towns, and, in general, to all who are wholly deprived of a just proportion of vegetable aliment. On the other hand, vegetable food being less stimulating is also less nourishing; besides, this kind of aliment is, upon the whole, of more difficult assimilation than the food derived from the animal kingdom. Hence it is, perhaps, that nature has provided a greater extent of digestive organs for animals wholly herbivorous. It is insufficient to raise the human system to all the strength and vigour of which it is susceptible. Flatulency of the stomach, muscular and nervous debility, and a long series of disorders, are not unfrequently the consequences of this too sparing diet. Some Eastern nations, indeed, live almost entirely on vegetable substances; but these, it is remarked, are seldom so robust, so active, or so brave, as men who live on a mixed diet of animal and vegetable food. Few, at least, in the countries of Europe can be sufficiently nourished by vegetable food alone; and even those nations, and individuals, who are said to live exclusively on vegetables, because they do not eat the flesh of animals, generally make use of milk at least, of eggs, and butter and cheese.