HYDROPHOBIA. 



307 



and rabbits, by intravenous inoculation ; or the inoculation 

 may be made in a little pocket at the root of the tail. For 

 the production of immunity in cattle, a dry powder made 

 from the muscles of animals dead with the 

 disease has been used with much success. * 137> 



Hydrophobia (Rabies; Lyssa). 



Although the specific cause of rabies is as 

 yet unknown, its clinical history corresponds 

 with the history of the other infectious dis- 

 eases so closely that no other inference is pos- 

 sible than that the disease is caused by some 

 micro-organism. The exciting cause, then, is 

 unknown. All we know of this disease and 

 of its action and manifestations and results 

 we owe to the painstaking and untiring work 

 of the great Pasteur. Even the treatment 

 which is of the most avail originated with 

 him. 



All warm-blooded animals are susceptible 

 to rabies. It is communicated to man by 

 direct inoculation. 



Judging from the very rapid action of the 

 infectious material and the fact that the prin- 

 cipal manifestations of the disease are at points 

 far distant from the site of inoculation, we can 

 come to only one conclusion that the disease 

 is a toxaemia. It can be classed with tetanus 

 and diphtheria. 



The most common source of infection is a 

 rabid animal, especially the dog, which by its 

 bite conveys the disease to man. 



Hydrophobia is a common disease in most 

 countries of Europe, especially France, Russia, and Belgium. 

 It is rather infrequent in this country ; in Australia the disease 

 is entirely unknown. 



In order that infection can take place, it is necessary that 

 there be an injury, and that the saliva of the affected animal 



Colonies of the ba- 

 cillus of symptom- 

 atic anthrax, in 

 deep gelatin cult- 

 ure. (After Fraenkel 

 and Pfeiffer.) 



