279 



The Percentage Value of the Leucocytes. — If 

 we now make a differential count in a stained 

 specimen we shall be able to ascertain what 

 change, if any, there is in the relative percentage 

 of the different kinds (for normal values vide 

 p. 42). 



1. The main characteristic change is that 

 there is an increase in the percentage of large 

 mononuclears, so that at times they may even 



■■ outnumber the polynuclear. 



2. The change is especially well-marked in 

 the periods of apyrexia {i.e., when there is a leuco- 

 penia). When there is a leucocytosis the increase 

 in the mononuclears may not be apparent. 



As examples of this leucocytic change, we 

 may give the following : — 



(i) Small mononuclear i8"i per cent. 



Large mononuclear and 



transitional 31 "4 ,, 



Polynuclear 50-2 ,, 



Eosinophil 0*4 ,, 



A fatal case of malignant tertian (Bastianelli). 

 (ii) Small mononuclear ig'i per cent. 



Large mononuclear and 



transitional 41 "o ,, 



Polynuclear 3g"o ,, 



Eosinophil o"6 ,, 



A fatal case of comatose malignant tertian (Bas- 

 tianelli). 



■* Panse. — Malignant tertian fever, t. 37-2° C 

 (iii) Small mononuclear i8'i per cent. 



Large mononuclear and 



transitional 26'4 ,, 

 Polynuclear 55"3 



^ Zeitichrift fur Hygiene, 1903 p. 592. 



