animal is also sufficient for her during pregnancy. We are forced to
conclude that protein was used more sparingly in the latter
condition--a view which has been repeatedly confirmed with regard to
human beings as well as animals. It is found, for example, that an
amount of protein competent to meet the needs of a man of a given
weight will not only provide for the wants of a woman of equal weight
while she is pregnant, but will also leave a surplus sufficient for
the growth of the fetus.

With regard to the mineral substances, likewise investigations
indicate that the "housekeeping" of the body during pregnancy
proceeds along unusually economic lines. It is not advisable,
therefore, to make any change in the diet with regard to these
substances. Attempts have been made to cut down the amount of
minerals in the food for the purpose of softening the fetal skeleton.
The success sometimes attributed to these efforts is, however, very
doubtful, for we know that the mother's tissues will be robbed of
minerals for the embryo whenever her food fails to contain them in
sufficient amount for her own needs and those of the child.
Practically speaking, the mineral content of diet during pregnancy
requires no thought, for so long as meat and vegetables are eaten in
satisfactory quantity the mineral nutrition will take care of itself.

The food-stuffs which supply heat and energy, since the amount of
energy utilized by the body during the latter months of pregnancy is
somewhat in excess of that previously required, do not follow the
same rule as the protein and the mineral matter. It has been found
that just before the fetus becomes mature the energy requirements of
the mother are approximately one-fifth greater than in the non-
pregnant condition. It is certain, however, that no extra demand for