PRESENCE OF BACTERIA 



65 



are strongly Gram positive and also have the unmis- 

 takable shape of bacilli, that their presence in the 

 alimentary lymphoid tissues can be so conclusively 

 proved. When we come to the demonstration of dis- 

 solving cocci in the tonsils of man and animals or Gram 

 negative bacilli in the human appendix the matter is 

 less certain, and I have only occasionally been able 



Fig. 30. 



From a photograph of bacilli in the lymphoid tissue of a healthy 

 rabbit's appendix, (Eosin-Gram stain; 1/12 in. objective.) 



to satisfy myself of their presence. But the demon- 

 stration might be easier to an expert in histology. Dr. 

 Buffer figured them conclusively in the dog's tonsil. 

 Hays says " on microscopic examination numerous bac- 

 teria can often be seen in the parenchyme " [of human 

 tonsils]. 



In the wall of the rabbit's appendix, most, if not all, 

 the bacilli are intracellular being contained in the small 



