AND ITS RELATION TO ANIMAL LIFE 9 



conditions these gases are readily separated 

 from it." 



The haemoglobin, having such an affinity for 

 oxygen, and oxygen playing such an important 

 part in animal life, it is evidently of vital im- 

 portance that the animal should have the 

 maximum percentage of haemoglobin in the 

 blood, yet there is ample evidence to show 

 that there is great variation in the percentage 

 of this proteid substance in the blood brought 

 about by the varying amount of chlorophyll 

 matter present in the food. 



In the Introduction to his Human Physio- 

 ology, pp. 37-38, Augustus D. Waller, M.D., 

 F.R.S., states that in Disease the proportion of 

 haemoglobin in the blood often falls from 

 12% to i or 2%. 



It is also well known that the red corpuscles 

 should be so numerous in the blood as to make 

 it a thickish liquid, but the proportion varies 

 considerably, as proved by analysis, as it is 

 entirely dependent on the kind and amount of 

 food eaten. 



Having recognized the fact that there is a 

 considerable variation in the percentage of 



