CELL SIZE AND METABOLIC ACTIVITY IN AMPHIBIA. 373 



VI. GENERAL COMPARATIVE RESULTS. 



A. Comparison of Classes of Vertebrata. 



Table VI I. has been prepared to show the cell size variations 

 between the various classes of vertebrates, as indicated by 

 measurements made on corpuscles from a selected representative 

 of each class. 



TABLE VII. 



RED BLOOD CELL SIZE IN SELECTED SPECIES OF VERTEBRA: A. 



I lie frog is below the average of red blood cell size for Am- 

 phibia, .md the rock bass is below the average for fish. Man is 

 above the average for mammals. The chicken and rattlesnake 

 .ire near the average for their respective classes. The arrange- 

 ment df the classes in order of increasing activity would result 

 in the same order as that in Table VII. The avian corpuscle is 

 nucleated, while that of the human is not. There is less differ- 

 ence in bulk of hemoglobin between the two than the measure- 

 ments \\<mld indicate. 



tt. ( 't'tnptirison of Different Species of Amphibia. 



In Table \ III. the species used in this study are listed in 

 order dt their red blood cell size, and columns are filled in for 

 weight and carbon dioxide production. All the figures are aver- 

 - <>t the detailed results recorded in Table I. 



A Mndy o! Table \ III. shows that the general trend is clearly 

 in the direction of increasing carbon dioxide output with de- 

 creasing cell size, but the results are complicated by the fact tint 

 the species with large cells are also large in size. To eliminate 

 the wegiht factor, representatives of several species have been 

 chosen \\ hich have comparable weights, and the results from these 



1 Taken ("mm Gulliver (1875). 



