Bauhaus-Universität Weimar

Reports of Visits to Foreign Laboratories, vol. 2 (1910) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Benedict, Francis Gano
Laboratory of the Phamalogical Department of the 
./omen’s Medical College. 
Processor A. A. Likhatscheff. 
Respiration apparatus for snail animals.-l/uch to my surprise, I found 
installed in Professor Likhat.cheff ' s 1 aboratory a new respiration apparatus 
for small animals on the Regnault-Reiset principle, the details of which had 
been worked out in a very ingenious manner. Several photographs which were 
taken of it are given in Pigs. 94 to 100. 
She pump, which is clearly shown in Pig. 100, consists of two rubber bulbs 
with Bunsen valves in them, upon which pressure is brought alternately by a 
rocker arm, actuated by an electric motor. This pushes the air through a 
system of purifiers consisting of vessels containing sulphuric acid and a 
solution of caustic potash, and thence to the chamber. After leaving the 
chamber, it passes through another system of purifiers, these purifiers being 
placed upon the pan of a delicate balance. (See Pig. 97) . As the oxygen is 
consumed, the pressure inside the chamber decreases and new oxygen is auto¬ 
matically admitted from a tall standpipe which is partly filled with water. 
As oxygen is admitted, the water rises in the standpipe and can be read on a 
graduated scale at the left. (See Pigs. 90 and 99). 
Professor Likhatscheff is evidently developing this apparatus with great 
care and is even so particular as to have oxygen above the water in the supply 
tank leading to his reservoir, so as to avoid any possibility of nitrogen in 
the water and therefore have oxygen replaced by nitrogen. As a matter of fact 
from the method of calculating the results I can see no reason why this should 
introduce a serious error.


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