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
decomposition depends upon the amount of the solution and the intensity 
of the light. He finds that the products of decomposition of the ultra¬ 
violet light absorb the light itself, so that the solution must be con¬ 
tinually stirred. He has many interesting devices for doing this. He 
claims that the light reduces the sugar to carbon dioxide and water and 
says that he can make an "element^ay analysis of sugar at room température* 
by the light method. Obviously this is only of theoretical interest hut 
nevertheless of great importance. 
He is also working on the effect of light on bacteria, the lower 
organisms and mice, and has carried out an esx'ec^aHy interesting series 
of experiments on mice during pregnancy. Rubner’s law of growth, interests 
them very much and they are trying the effect of ultra-violet light on 
growth, using the weight of the food and excrement and the weight of the 
animal as an index. Rubner says that the animal doubles its weight with 
certain food in a certain time and increases at a regular rate. 1 pointed 
out to Dastre and Henri that the mice in these experiments might have been 
stimulated by the light to a much greater muscular activity than those 
without this stimulation; consequently to make the experiment complete, 
there should also be a record of the musciilar activity, particularly as no 
records of the carbon-dioxide production per day are secured. I explain¬ 
ed to Dastre the principle of our suspended cage whereby our records of 
the muscular activity are obtained and he was much interested in it. 
In discussing the alcohol program, Dastre spoke of the effect 
of alcohol on growth, evidently having in ihind the xiltra-violet light 
experiments. I told him that I hoped he v/ould make an experiment with 
alcohol, but if he is to use the body-weight, alone as index, he must 
make sure that the muscular activity is constant or comparable. 
A number of researches v'ere in progress in Dastre’s laboratory 
in regard to the sugar content of the blood and the sugar in diabetes.


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