"Another weighty objection against a vegetable diet, I have heard, has been made by learned men; and is, that vegetables require great labor, strong exercise, and much action, to digest and turn them into proper nutriment; as (say they) is evident from their being the common diet of day-laborers, handicraftsmen, and farmers. This objection I should have been ashamed to mention, but that I have heard it come from men of learning; and they might have as justly said, that freestone is harder than marble, and that the juice of vegetables makes stronger glue than that of fish and beef! "Do not children and young persons, that is, tender persons, live on milk and seeds, even before they are capable of much labor and exercise? Do not all the eastern and southern people live almost entirely on them? The Asiatics, Moors, and Indians, whose climates incapacitate them for much labor, and whose indolence is so justly a reproach to them,--are these lazier and less laborious men than the Highlanders and native Irish? "The truth is, hardness of digestion principally depends on the minuteness of the component particles, as is evident in marble and precious stones. And animal substances being made of particles that pass through innumerable very little, or infinitely small excretory ducts, must be of a much finer texture, and consequently harder, or tougher, in their composition, than any vegetable substance can be. And the flesh of animals that live on animals, is like double distilled spirits, and so requires much labor to break, grind, and digest it. And, indeed, if day-laborers, and handicraftsmen were allowed the high, strong food of men of condition, and the quiet and much-thinking persons were confined to the farmer and ploughman's food, it would be much happier for both.