316 BACTERIA IN INFECTIOUS DISEASES. 



upon the etiology of this disease. These facts he 

 has summarized as follows : 



" I. The silent (la rage mue) and furious forms of 

 rabies proceed from the same virus. Indeed, we have 

 found experimentally that one form, may give rise to the 

 other. 



" II. Nothing is more varied than the symptoms of 

 rabies. Each case has, so to speak, its own peculiar 

 symptoms, the special characters of which, there is 

 reason to believe, depend upon the particular part of 

 the nervous system, of the brain, or of the spinal mar- 

 row, where the virus locates itself and multiplies. 



u III. The virus is associated in the saliva of a rabid 

 animal with various microbes ; and this saliva may 

 cause death, by inoculation, in three different ways: 



" By the new microbe which we have made known 

 under the name of the microbe of saliva; 



" By the excessive development of pus ; 



" By rabies. 



" IV. The medulla oblongata of a person, or of one 

 of the lower animals, dead from rabies, is always vir- 

 ulent. 



" Y. The virus of rabies is not only found in the me- 

 dulla oblongata, but also in the entire brain or a portion 

 thereof. 



" It is also found localized in the spinal marrow, and 

 often in every portion of it. 



" The virulence of the spinal marrow is quite equal 

 to that of the medulla oblongata or of the brain ; and 

 this is true of the inferior as well as of the superior 

 portions. 



" So long as the brain and spinal marrow are not 

 invaded by putrefaction this virulence persists. At a 

 temperature of about 12 C. we have been able to pre- 



