Fick and 
Wislecenus 
experiment. 
110 ON THE PLACE OF FISH [IN 
(respired) oxygen, that is, with deficient exercise.” (16.) 
“In an equal number of respirations we consume more 
oxygen at the level of the sea than on a mountain. 
The quantity of both oxygen inspired, and of carbonic 
acid expired must therefore vary with the height of 
the barometer.” (17.) “The amount of oxygen 
capable of being taken up in the animal. body is 
limited by the amount of oxygen which can come 
into contact with the blood, and of blood which can 
come into contact with the oxygen.” (19.) “The 
supply of heat lost by cooling is effected by the 
mutual action of the elements of the food, and the 
inspired oxygen which combine together. . . . It 
signifies nothing what intermediate forms food may 
assume, what changes it may undergo in the body ; 
the last change is uniformly the conversion of its 
carkon into carbonic acid, of its hydrogen into water ; 
the unassimilated nitrogen of the food together with 
the unburned or unoxidized carbon is expelled in the 
urine or in the solid excrements.” (21.) 
Note to p. 20. 
In 1866 Dr. A. Fick, Professor of Physiology, Zu- 
rich, and Dr. T. Wislecenus, Professor of Chemistry, 
Zurich, made their celebrated ascent of the Faulhorn, 
celebrated, not in connection with any sensational 
narrow escapes, but because it was selected as a 
form of exercise undertaken to test whether muscular 
exertion was associated with the oxidation of nitrogen. 
The bearings of their investigations on the then 
state of the question of the origin of muscular power 
are set forth in a paper they communicated to the 
‘ Philosophical Magazine’ through Professor Wanklyn. 
~ 
