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
Zoophysiological Laboratory. 
Dr. Krogh. 
Dr. Krogh, a former pupil of Bohr, has a special institute for 
animal physiology in Copenhagen. He is certainly one of the most 
ingenious and exceptional men to he found anywhere in Europe. His 
laboratory is small but well lighted and practically arranged. For 
example, all the tables can easily be changed if necessary and all the 
plumbing is removable. He has very few students and unfortunately 
no assistants. 
The lower floor of the laboratory is a small workshop in which 
admirable work can be done. Krogh is certainly an extensive experi¬ 
menter and impresses one as doing very careful and exact work. He 
has an ingenious respiration apparatus on the closed-circuit principle 
in which he removes all the carbon dioxide from the expired air by 
passing it through a large tank of soda lime forming a part of the 
circuit. The soda lime in this tank had not been removed for about 
two years and still absorbed all the carbon dioxide expired by the 
Krogh does not déterminé the carbon dioxide directly but obtains 
the respiratory quotient by gas analysis. The amount of oxygen intro¬ 
duced is measured by a clever meter devised by Krogh, so arranged that 
each electrical contact represents 0.88 liter of oxygen. Krogh main¬ 
tains that he was the first one to use a spirometer in the respiration 
circuit and that he showed his device to Dr. Carpenter some years ago. 
The spirometer is not immersed in water, the experiments being so short 
that Krogh does not think it necessary. It is calibrated by letting 
one or two liters of water flow into a special glass vessel. (See


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