440 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 

 carbon 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. 350. 



Pick and In 1866 Dr. A. Pick, Professor of ^Physiology, Zu- 



experiment. r ^ c ^> anc ^ 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. 



