108 ELEMENTS OF APPLIED MICROSCOPY. 
their red color and abnormal colorless and crenated cells. 
The other formed elements of the blood, the white cor- 
puscles (polymorphonuclear leucocytes), are larger bodies, 
more or less spherical and possessing several nuclei; the 
Fic. 42. URINARY SEDIMENT IN CATARRH OF THE BLADDER. (Acid 
urates, ammonium-magnesium phosphate, leucocytes and epithelial 
cells.) (After Ultzmann and Hofmann.) 200 diameters. 
latter may be brought out clearly and differentiated 
from the cells of the renal epithelium by allowing dilute 
acetic acid to run under the cover-slip when the nuclei of 
the two types of cell may be made out. The characteristics 
