DETERMINING BIOLOGICAL ACTIVITIES OF BACTERIA 171 



animal should be clipped and the skin disinfected with carbolic acid 

 or alcohol. 



Subcutaneous inoculations are most conveniently made in the abdom •■■ 



Fig. 51. — Intraperitoneal Inoculation of Gttinea-pig. 



iBBB»iliiiiiiS3p|93 



Fig. 52.^Guinea-pig Cage, 



inal wall, where the skin is thin. After cUpping and steriUzing, the 

 skin is raised between the fingers of the left hand and the needle plunged 



