FIG. 1. 



FIG. 2. 



FIG. 1. Human blood-corpuscles, fresh ; magnified 840 diameters, -fa inch homogeneous oil- 

 immersion-objective by Zeiss, original negative amplified twice (Stratford). 



FIG. 2. Blood of Guinea-pig, spread and dried on glass cover; magnified 1,450 diameters, iV 

 inch homogeneous oil-immersion-objective by Zeiss, and Tolles's amplifier (Sternberg). 



