Il8 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



cordingly the daily consumption and loss is enormous, 

 and is equaled only by as constant and regular a 

 production of new cells. Their number in man is 

 5,000,000 per cubic millimeter. 



The following table gives the size of the red blood- 

 corpuscle in the different groups of animals : 



Man 7.2 to 7.8 ft. 



Monkey 7.0 ft. 



Dog 7.5 ft. 



Cat 6.2 ft. 



Horse 5.6 ft. 



Chick. .. .12.1 by 7.2 p. 



Duck 12.9 " 8.0 ft. 



Tortoise. .21.2 " 12.5 ft. 



Snake 22.0 " 13.0/1. 



Frog 22.3 " 15.7 ft. 



Guinea-pig . . 



7.5 



Newt . . ..30.7 



19.0 ft. 



White Corpuscles. These are colorless, nucleated, 

 plastic, ameboid cells. Their number in man is 

 from 7000 to 10,000 per cubic millimeter. They are 

 variously classified according to the morphology of 

 their nuclei, or the granules in the cytoplasm that 



Small 



mononuclear. . 



Fig. 83. White blood-corpuscles from man. 



take different stains, or as to their origin, or as to 

 their function. For practical purposes they may 

 be classified as : 



1. Lymphocytes size 8 to 10 microns. ... 22 per cent. 



2. Large mononuclear leucocytes. *' iotoi5 " ....4 " " 



3. Polynucleated " 12 " ....74 " " 



(a) Mast cells 0.4 per cent. 



(b) Eosinophiles 2 to 4 " " 



(c) Neutrophiles 70 u " 



