Bauhaus-Universität Weimar

Reports of Visits to Foreign Laboratories, vol. 3 (1913-16) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Benedict, Francis Gano
Dr. digon. 
Dr. Ciigon is now in the I Medical Clinic and is not doing so 
much scientific work as formerly. I investigated carefully some 
of the researches he published a short time ago. he uses Muller 
valves with two large Woulff bottles of about 2 liters each. These 
are filled about two thirds full with water, a glass tube as large as 
would go through the tubulatures just dipping under the water. He 
considered them very satisfactory. 
I expected to find an elaborate system for diluting expired air 
to make it about one per cent carbon dioxide. Instead of that I 
found that he simply expires the air into a spirometer, and after 
fifty liters of expired air has collected, he pumps in 100 or more 
liters of external air, and analyzes on this basis. He does not mix 
it at all and thinks an ordinary diffusion sufficient. He uses a 
mouthpiece and, like Loewy, has a band to tie it to the face; he be¬ 
lieves that all leaks are thus prevented, and the best results obtained. 
He makes all of his experiments with the subject asleep, if possible, 
usually in the evening after fasting all day, and considers the sleep¬ 
ing condition more favorable for such measurements. His analyses are 
made on a very imperfect Pettersson gas-analysis apparatus. I was 
much impressed by his carelessness in ordering a burette for this 
apparatus. He attempted to secure a burette that would allow him to 
measure at the same time both the carbon-dioxide increment and oxygen 
deficit in expired air, and had therefore planned to get from 0 to 
5 per cent of carbon dioxide, but had provided for a measurement of 
the oxygen only between 19.5 per cent and 21.0 per cent, in other words 
1.5 per cent instead of 4 or 5 per cent. This would imply a lack of 


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