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906 METABOLISM.
kept alive with boiled meat and polished rice. They emaciate quickly
and rapidly recover again if they receive oryzanine.
It follows from the above that there exists a certain unexplainable
contradiction between the important observations of Stepp and those
of the other investigators on the one side and the very interesting, prolonged
experiments of Osborne and Mendel with pure foodstuffs on the
other side.
ffl. METABOLISM WITH VARIOUS FOODS.
For carnivora, as above stated, meat as poor as possible in fat may
be a complete and sufficient food. As the proteins moreover take a special
place among the organic nutritive bodies by the quantity of nitrogen they
contain, it is proper that we first describe the metabolism with an exclu-
sively meat diet.
Metabolism with food rich in proteins, i.e., feeding only with meat as
poor in fat as possible.
By an increased supply of proteins the catabolism and the elimination
of nitrogen is increased, and this in proportion to the supply of proteins.
If a certain quantity of meat has daily been given to carnivora as
food and the quantity is suddenly increased, an augmented catabolism
of proteins, or an increase in the quantity of nitrogen eliminated, is the
result. If the animal is daily fed for a certain time with larger quantities,
of the same meat, a part of the proteins accumulates in the body, but
this part decreases from day to day, while there is a corresponding daily
increase in the elimination of nitrogen. In this way a nitrogenous
equilibrium is established; that is, the total quantity of nitrogen eliminated
is equal to the quantity of nitrogen in the absorbed proteins or meat.
If, on the ’contrary, an animal in nitrogenous equilibrium, having been
fed on large quantities of meat, is suddenly given a small quantity
of meat per day, it uses up its own body proteins, the amount de-
creasing from day to day. The elimination of nitrogen and the catab-
olism of proteins decrease constantly, and the animal may in this case,
also pass into nitrogenous equilibrium, or almost into this condition
These relations are illustrated by the following table (Voit): 1
Grams of Meat in the Food per Day.
1
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