190 Scientific Proceedings, Royal Dublin Society. 



PLATE XVII. 



Fig. 



1. Photograph of the same plate culture after two days further 



incubation at 37° C, in absence of the radium. 



2. Same plate four days later. During the interval the culture was 



incubated at 37° C. It may be noticed that the sterile patch 

 has not diminished in size, nor has the inoculation in its 

 centre developed. 



