20 Modes of Inpeotion. 



ceiving 100 c.c. twice a day (once in the morning and 

 the other time in the evening) for over 120 days was 

 not infected at all. 



100 c.c. of the patient's blood was given to four 

 horses (Experimental horses-extra series Nos. 9. 10. 43. 

 44.) mixed with the feed every day or every other day. 

 Two out of the four became ill after about 50 days, and 

 the remaining escaped affection. 



Faeces of a patient were given mixed with the feed 

 every day to five horses. The result was negative. 



From the above experiments conclusion can be 

 reached that the entrance of the virus into a healthy 

 individual through its alimentary canal can actually take 

 place, but, since infection by this mode is accomplished 

 only by protracted application of an unnatural method, 

 contact infection in nature, if any, must be a very slow 

 and limited process. 



C. Infection in the Stable. 



Patients and healthy individuals were quartered in 

 the same stable to see if infection takes place among 

 them. Of eleven horses used for the experiment only 

 two became affected. The experiments were performed 

 purposely during the winter, when the development of 

 insects is suspended. 



1. For six months, from August 1910 to January 



1910, three healthy animals (Experimental horses Nos. 

 6-8) were kept with the patients at Hagino Branch 

 Remount Depot. One horse became affected after 64 

 days, and in the other two the result was ambiguous. 



2. For five months, from December 1910 to April 



1911, three healthy horses (Experimental horses Nos. 90, 

 108, 487) were kept with a patient at the Experiment 



