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 



FIG. 18. Showing method of filling pipette. 



a. Is the mark on the tube. b. The serum, c, c, c. The columns 

 of emulsion separated by the air bubbles d, d, d. e. Is the cotton- 

 wool plug. 



H 



