Milk is constipating, and as constipation is one of the commonest complaints, a preventive may be found in abstinence from this food. As regards eggs, there is perhaps not so much to be said, although eggs so quickly undergo a change akin to putrefaction that unless eaten fresh they are unfit for food; moreover, (according to Dr. Haig) they contain a considerable amount of xanthins, and cannot, therefore, be considered a desirable food. Dairy foods, we emphatically affirm, are not necessary to health. In the section dealing with 'Physical Considerations' sufficient was said to prove the eminent value of an exclusive vegetable diet, and the reader is referred to that and the subsequent essay on Nutrition and Diet for proof that man can and should live without animal food of any kind. Such nutritive properties as are possessed by milk and eggs are abundantly found in the vegetable kingdom. The table of comparative values given, exhibits this quite plainly. That man can live a thoroughly healthy life upon vegetable foods alone there is ample evidence to prove, and there is good cause to believe that milk and eggs not only are quite unnecessary, but are foods unsuited to the human organism, and may be, and often are, the cause of disease. Of course, it is recognized that with scrupulous care this danger can be minimized to a great extent, but still it is always there, and as there is no reason why we should consume such foods, it is not foolish to continue to do so? But this is not all. It is quite as impossible to consume dairy produce without slaughter as it is to eat flesh without slaughter. There are probably as many bulls born as cows. One bull for breeding purposes suffices for many cows and lives for many years, so what is to be done with the bull calves if our humanitarian scruples debar us from providing a vocation for the butcher? The country would soon be overrun with vast herds of wild animals and the whole populace would have to take to arms for self-preservation. So it comes to the same thing. If we did not breed these animals for their flesh, or milk, or eggs, or labour, we should have no use for them, and so should breed them no longer, and they would quickly become extinct. The wild goat and sheep and the feathered life might survive indefinitely in mountainous districts, but large animals that are not domesticated, or bred for slaughter, soon disappear before the approach of civilisation. The Irish elk is extinct, and the buffalo of North America has been wiped out during quite recent years. If leather became more expensive (much of it is derived from horse hide) manufacturers of leather substitutes would have a better market than they have at present. VI CONCLUSION