What is the cause of morbid action in the animal system? Not the air we breathe, for our fellow denizens of nature breathe the same uninjured; not the water we drink, if remote from the pollutions of man and his inventions, for the animals drink it too; not the earth we tread upon; not the unobscured sight of glorious nature, in the wood, the field, or the expanse of sky and ocean; nothing that we are or do in common with the undiseased inhabitants of the forest. Something then wherein we differ from them; our habit of altering our food by fire, so that our appetite is no longer a just criterion for the fitness of its gratification. Except in children there remains no traces of that instinct which determines, in all other animals, what aliment is natural or otherwise; and so perfectly obliterated are they in the reasoning adults of our species, that it has become necessary to urge considerations, drawn from comparative anatomy, to prove that we are naturally frugivorous. Crime is madness. Madness is disease. Whenever the cause of disease shall be discovered, the root, from which all vice and misery have so long overshadowed the globe, will lie bare to the axe. All the exertions of man, from that moment, may be considered as tending to the clear profit of his species. No sane mind in a sane body resolves upon a real crime. It is a man of violent passions, bloodshot eyes, and swollen veins, that alone can grasp the knife of murder. The system of a simple diet promises no Utopian advantages. It is no mere reform of legislation, whilst the furious passions and evil propensities of the human heart, in which it had its origin, are still unassuaged. It strikes at the root of all evil, and is an experiment which may be tried with success, not alone by nations, but by small societies, families, and even individuals.