84 



GUIDE TO THE STUDY 



, 



. 



,; 



Eosinphils 



Neutrophils 



I 



! 





'/ 



. -■' 



Monocytes 



^ 't .< .'■ 



' '■:(■ y 



TZeds 



f) 



@v#)# 



Fig. 26. — Normal human blood. (From cAart by Dr. Hal Downey.) 



