126
Second Nodical Clinic, Charité.
■professor Dr, Prugsch, and Professor von Bergmann,
Dr. Plesch.
This new i'J. edical Clinic is in a marvellous building, as elegant as the
new Rockefeller Institute Hospital in hew York, all of the fittings being
of the finest and most expensive character. "Tie chemical laboratory is
beautifully equipped with a special room for ether extractions, Xjeldahl
digestions, sand-baths heated with gas, and a drying apparatus after the
principle of Taust. Below is the Roentgen ray room, with lead glass
windows, and electro-cardiogram apparatus with a string galvanometer,
the vibrations being deadened by means of a sand mattress (ITikolai).
The respiration calorimeter, mb. ich is a Rubner apparatus intended for
experiments with dogs and children, is very perfect. Professor Heubner
of the Children's Clinic was in the room when they were explaining it to
me and when they made the statement that it could be used for either dogs
or children, he shook his head. It is now modified so that determinations
of the oxygen may be made. There is a large soda line chamber, but the
carbon dioxide is still determined by barium hydroxide. The oxygen is
supplied from a bomb and the bomb is weighed. Professor Kraus said that he
anticipated great results from this chamber.
There was also a large Rubner respiration apparatus or Petterikofer-Yoit
chamber for man, and a Zuntz-Peppert apparatus, and they had planned to use
the latter apparatus inside the large chamber. Dr. Plesch, who^made a great
many gas analyses in the laboratory, said that he had used both the Zuntz-
Ceppert apparatus and also Haldane's, but thinks it all depends upon mho
\ises it. He also believes that the Zuntz circulating scheme for oxygen
mill never work with these large respiration chambers. In discussing the
mercury pump in which water is used to raise and lower the mercury, Plesch