Bauhaus-Universität Weimar

Titel:
Reports of Visits to Foreign Laboratories, vol. 2 (1910) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Person:
Benedict, Francis Gano
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39745/225/
that one or two experiments were absolutely wrong. 
Dr. Krogh's experiments in Greenland.- In the Greenland experiments, 
ne gave the subjects a diet containing a large amount of protein and 
«nought that in this way he might he able to get some light on the for¬ 
mation O-i fat or glycogen from protein. He used seal meat and removed 
all the visible fat but found that there was an enormous amount of fat 
in ifie meat itself,-a fact which he had not realised. The apparatus was 
not air-tight, but there was always a diminished pressure, and he always got 
outdoor air with no leak outward. He believes that the carbon-dioxide 
in such an apparatus could easily rise to 1 per cent and the oxygen content 
would be not far from 20 to 21 percent. He calculates the total ingoing 
air from the nitrogen in the outcoming air, and analyses of the ingoing air. 
All the nitrogen coming out of the apparatus must have had a definite amount 
of oxygen with it when it went in. He also emphasizes the importance of an 
analysis of the residual air. He told me that his gas meter was accurate 
to 0.25 per cent wi th a constant level water at tac liment, and thinks this 
of the greatest importance, and that the gas must always be measured wet. 
He has no use for the paraffin oil arrangement of Staehelin. hrogh praised 
the Haldane gas analysis apparatus very highly. 
I lev; apparatus for .gas-analysis.- As he believes that the Jaquet 
principle is of fundamental importance in studying metabolism problems, and 
recognizes that it depends in general upon very accurate gas analyses, 
Krogh has busied himself during the last year with developing a new gas 
analysis apparatus. The pipette holds 50 cubic centimeters and is so divided 
that l/20 of each division equals 0.001 per cent of oxygen. By using a lens, 
he feels perfectly sure that he can read to 0.001 easily, as he has had a 
great deal of practice. After measuring the gas he dries it over phosphorus 
pentoxide hd says that the gas should always be thoroughly dried in a 
special chamber for this purpose. The pyrogallic pipette is unique in con-
        

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