Bauhaus-Universität Weimar

Reports of Visits to Foreign Laboratories, vol. 1 (1907) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Benedict, Francis Gano
published soon in the Ztsch. f. Biologie. He expects ultimately 
to see how long animals will live with small amounts of oxygen and 
considers the field very wide. 
Dr. Gamgee criticises Prof. Kronecker's chemical work very 
Experiments on the influence cf pressure on the lungs.--The tra¬ 
cheal canula employed in the above described experiments with rabbits 
was used primarily for the study of the supplementary problem of the 
effect of different pressures on the inside and outside of the lungs. 
Secondly, rabbits are very sensitive to the presence of increased 
carbon dioxide in the air. It acts reflexively on the nose mucous 
and closes the nose so that regular nasal breathing could not be 
With regard to the pressure on the lungs, he found that if there 
was a difference of 30 mm. of mercury in either direction, it would 
kill the animal. If there was a diminished pressure on the outside 
of the body, the animal would become distended and actually blow up. 
A study of this problem was possible only with the canula. 
Researches on the heart.—Prof. Eronecker is especially interested 
in problems of intermediary metabolism and thinks we have been all 
wrong in devoting our time to vork involving only measurement of the 
end products of metabolism. He was led to this work by his studies 
of mountain sickness. He thinks that mountain sickness is the physical 
effect of the pressure on the lungs and does not agree with the ideas 
regarding the influence of the variations in percentage of oxygen, 
carbonic cid, etc. Going back to the old experiments of Hermann 
and Pflttger, he finds that a muscle dan work for some time in a carbon 
dioxide free atmosphere, or indeed, in a vacuum, i.e., does not need 
any oxygen. Prof. Eronecker has washed out a frog's heart and let


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