4 6 



PROTOZOA AND DISEASE 



of some six rabbits and several guinea-pigs, and in every case with 

 a positive result. For the study of the growth and development 

 of these bodies, as seen in sections of corneae taken at different 

 periods after vaccination, I found the guinea-pig's cornea afford the 



FIG. 12. PART OF A SECTION OF A GUINEA-PIG'S CORNEA SEVENTY-TWO 

 HOURS AFTER VACCINATION. ( x 750 diameters. From Pathological 

 Society's Transactions, 1895, Plate VIII.) 



The site of inoculation is to the right. The intracellular bodies are larger and of 

 less regular form than those examined sooner after vaccination. Among the 

 free cells are some, such as a and b, that contain chromatin in various forms. 



more pronounced serial changes, though a similar progress was recog- 

 nisable also in the rabbit. Fig. 12 is copied from a drawing of 

 one of the specimens of the guinea-pig's cornea that was demonstrated 

 on the occasion referred to. Most of the intracellular bodies are 

 larger than those seen in corneae examined twenty-four or forty-eight 



