70 



SOLID CULTIVATION MEDIA. 



germs which might be carried upwards into the flask with the hot air 

 currents which are constantly rising from all the free surfaces of the 



Fig. 29. — Micrococcus of osteo-myelitis growing on bread paste, 

 body. ^ The inoculated bread paste may with advantage be incubated 

 at summer or at blood heat, in any of the forms of incubator em- 



' "Essays on the Floating Matter of the Air in relation to Putrefaction and 

 Infection" — Tyndall : London, 1881. 



