Without any undue egotism, may it not be possible for a generation of human beings, who have progressed so far in intelligence as to be able to move things by steam, to communicate across the ocean even without wires to guide our messages, and to see clearly through objects that are as dark as night to the unassisted human eye with the aid of an artificial light, to learn the secret of right self-nutrition and practise it in a manner that will not deprive us of the maximum of pleasure which Nature invariably gives as a reward for conformity with her beneficent requirements? May we not assume that beings who have learned to breed and train horses to race with human intelligence, and to run, trot, or pace a mile in less than two minutes, may also train themselves to have the proportional relative speed, endurance, and longevity that has been attained by race horses through man’s care, and to enjoy the pleasure of living that is evident in these favoured animals, mere servitors of man though they be? If this disparity of man is due to ignorance arising in self-neglect, which is the usual accompaniment of genius, may we not now, at the beginning of the pregnant twentieth century, rest for a moment from discovering, developing, and improving the world outside our personal selves and concentrate our attention for a while on learning to know and care for ourselves? May we not, at least, give “horse sense” attention to such a vital interest? * * * * * In the midst of the present confusion which exists among opinions as to the right conduct of life and activity, and the best manner and system of diet to be used to secure health and efficiency, it seems almost a vain appeal to call for concert of action in a matter of common and persistent neglect. Each person, as his own keeper, is careless, and in matters of bodily management no one feels called upon to be his brother’s keeper; but this is merely the lethargy of oversight and consequent ignorance, and this book is published to call attention to the oversight and to attempt to dispel the ignorance. * * * * *