gg shells, wall plaster, chalk and other earthy
substances. What do these things mean? Nothing more than this: both
chicken and child express a natural craving for the essential elements
to build bone and form the basis for the tissue.

I have discussed the important part the minerals play in both the
vegetable and animal kingdoms for the purpose of laying stress upon our
great need of more of them in our daily diet, and I may add that this is
equally as true in the case of those we call healthy as of those who are
diseased. No matter how carefully the diet may be regulated as regards
the quantity of protein and carbohydrates and fats and the ratio between
them, healthy metabolism is impossible without a sufficiency of the
essential minerals.

II.

How can we perform this imperative duty to mankind?

The solution of the problem of supplying these essential minerals
demands that our soil shall be properly fertilized for the growing of
wholesome vegetables and fruits and our cattle properly fed with a
ration rich in mineral content. Thus the food which we eat will contain
all of the elements necessary to the growth and maintenance of our
bodies in a state of health.

In the course of my effort to show why it is imperative that we pay
greater heed to the mineral content of our foodstuffs, and why it is
imperative that we enrich that content, I have shown basically how that
end is to be attained.

In conclusion I will cite the result of a series of experiments in
applying the principles of physiological chemistry to poultry, and I may
say that it took me twelve years to find the breed which would most
readily lend itself to my purpose. I experimented with 250 varieties of
hens before I found the one most amenable to my method of feeding and
breeding.

While living at Needham, Massachusetts, I made a thorough test of my
principles with the selected variety of hens. They were not only fed a
ration properly balanced for protein, carbohydrates and fat, but I gave
them a liberal supply of properly prepared mineral salts. I used three
different mixtures of feed, made up in 100 pound lots, in which the
proportion of albumen ranged from 13.50 to 18.00 pounds; of fat from
4.00 to 5.00 pounds; of carbohydrates from 41 to 44 pounds; and actual
nutritive salts from 4.50 to 5.00 pounds. The respective ratios being:
1:4, 1:3.5 and 1:3

It is not necessary to enter into discussion of the details of the
feeding method and the