218 



Chapter XXII 

 CLINICAL STUDY OF MALARIA 



THE LEUCOCYTES IN MALARIA 



We shall consider (i) the total leucocytes, (2) the 

 percentage value of each kind. 



The Total Leucocytes. We may take 10,000 as 

 the normal value per mm. 3 , and as 5,000,000 is the 

 normal value for red cells, the proportion of white to 

 red is 



WC 10,000 i 



RC 5,000,000 500 



Now, in malaria, we may find two conditions, 

 either that the total number of leucocytes is con- 

 siderably below the normal value, 10,000, i.e., there 

 is leucopenia or hypoleucocytosis, or that the total 

 number is much above 10,000, i.e., leucocytosis. If 

 there is leucopenia, say, for instance, the total number 

 is 5,000 instead of 10,000, then 



WC 5,000 i . ,, , WC 



_^_^ = _ _2L. -ss- -, i.e., the traction -^-=- 

 RC 5,000,000 1,000 RC 



is smaller than normal. 



If, on the contrary, the total leucocytes are 

 20,000 instead of 10,000, i.e., leucocytosis, then 



WC 20,000. i . , , . WC 



-=-^ = = = , i.e., the fraction =-=- 



RC 5,000,000 250 RC 



is greater than normal. 



