IIO ELEMENTS OF APPLIED MICROSCOPY. 
the ear by pricking with a sterile lance or glover’s needle 
after carefully washing the surface of the skin. A small 
drop should be caught on the edge of a clean slide, which 
Fic. 43.— URINARY SEDIMENT IN ACUTE BricHt’s DisEasE. (Granu- 
lar casts, leucocytes, and epithelial cells.) (After Ultzmann and 
Hofmann.) 200 diameters. 
is then brought in contact with the surface of a second 
clean slide. The upper glass is drawn along the lower one 
at an acute angle so that the blood-drop escapes beneath 
its edges and is spread over the lower slide in a thin 
