activity and net the work of digestion, experiments should show
some difference with smaller amounts of food trat not necessarily
in proportion.
In discussing the muscular activity of the dogs, Prof. Cohn-
heim says that Putner's apparatus has a so-called volumeter which
should indicate restlessness on the part of the dog, as it indi¬
cates variations in the volume of the air inside the chamber.
As near as I can make out, the dog is in the bulb of a large
air thermometer and any restlessness would cause an increase in
the volume of air by virtue of the increased heat production.
Muscle .juices.—By means of the Kossel cutting machine ~nd
the saefte presse of Juchner has obtained 60 per cent of fresh
muscle in a clear juice without the addition of any water. Prom
liver he obtained but 40 per cent.
Woman with a Pawlow fistula.—Br. Bickel in Berlin has a
v;oman who has a Pav/low fistula who would be willing to come to
America for experiments on artificial feeding if paid. She may
prove a second Alexis 3t. Martin.
Heat of hydrolization of proteins.—Prof. Cohnheim thinks
that the heat of the hydrolization of the proteins is very small,
perhaps three or four per cent. The main thing in protein
metabolism is the oxidation of the amino acids. If we feed meat
extract, we should have no hydrolization to speak of as the meat
extract is to a large extent, at least, excreted unchanged.
(I called his attention to Prof. Folia’s claim that under
certain conditions, creatine was retained in the body.) Prof.
Cohnheim thinks that the small amount of meat extract used played
no role in the true digestive process and the experiment should be