70 



ANATOMY 



A series of determinations on the increase in the number of 

 leucocytes with age, table 32, has been made by Jolly ('19). 



TABLE 32 



Changes in the number of leucocytes with age 



According to Jolly ('19) the number of leucocytes tends to increase with age 



Fetus at term. 



1 day 



8 days 



15 days 



30 days 



60 days 



365 days 



NUMBER OP LEUCOCYTES PER MM.' 



In the rat before birth the numbers of cells have been deter- 

 mined by Addison and Richter (MS '23). The leucocytes and 

 erythrocytes increase from the 18 day to the 21 day stage — 

 while the erythroblasts decrease — table 33. 



TABLE 33 

 Cells in 1 mm.^ of prenatal blood {Addison and Richter, MS. '23). The number of 



cases are in parentheses 



TABLE 34 

 Red cells and platelets of normal albino rats {condensed from Cramer, Drew and 



and Mottram, '22) 



For the number of blood platelets in normal albino rats data 

 are presented in. table 34. 



