42 



MICRO-ORGANISMS AND DISEASE [chap. 



of small quantities, but prefer using each time a fresh 

 capillary glass pipdte made just before the inoculation. 

 Into this pipette I draw the small quantity to be used 

 for inoculation, and having made a very small puncture 



FiG. 6.— Hot-water Filtur for Filtering Nutritive Gelatine ok 

 Agar-Agar Mixture. 



through the skin, the pointed end of the pipette is pushed 

 through it into the subcutaneous tissue for about half an 

 inch or one inch and then the fluid is blown out into the 

 tissue. In this way I, am always absolutely safe from any 

 contamination with a previously used virus, which might 



