MACROSCOPIC METHOD. 97 
bottom in flocculent granular masses, which are similar 
whether living or dead bacilli have been used. In the 
former case there is no difficulty in determining whether 
Fic. 18.—Showing method of filling pipette. 
a. Is the mark on the tube. 6. The serum. c¢,c,c. The columns 
of emulsion separated by the air bubbles d, d,d. e. Is the cotton- 
wool plug. 
H 
