vii INFECTION OF ANIMALS WITH PLAGUE 191 



Experiment 10. — Kice and wheat were in each 

 instance mixed, on July 11, with finely minced bits of 

 spleen and lung of a guinea-pig dead of typical subacute 

 plague, and placed to dry spontaneously in the same 

 manner and under the same arrangement as in the 

 previous experiment. 



On July 21, that is after ten days, the materials 

 were found quite dry, and were used for making emulsions 

 in warm water for injection subcutaneously of two guinea- 

 pigs :— 



Guinea-pig No. 19. — " Kice-plague " organs. 



Guinea-pig No. 20. — "Wheat-plague" organs. 



Both animals remained without tumour and lively. 

 They were killed after one week and were found quite 

 normal. 



Experiment 11. — A guinea-pig died on September 27 

 from typical subacute plague. Its organs (bubo, spleen, 

 liver, and lungs) were finely minced, mixed with sand and 

 with earth respectively, and placed to dry spontaneously 

 in the laboratory under the same conditions as in previous 

 experiments. By the end of a week (October 4) the 

 materials seemed fairly dry, and were used to inject 

 guinea-pigs : — 



Guinea-pig No. 21. — " Sand-plague" organs. 



Guinea-pig No. 22. — "Earth-plague" organs. 



Guinea-pig No. 22 was found dead on October 7 with 

 very intensive acute plague ; guinea-pig No. 21 was found 

 dead on October 10 with typical subacute plague. 



Experiment 12. — The same "sand" and "earth" 

 plague materials were used for injection of guinea-pigs on 

 October 11, that is after a fortnight's drying : — 



Guinea-pig No. 23. — " Sand-plague " organs. 



