DISEASES OF THE NERVOUS SYSTEM. 317 



tTirbanee arising from real pain or mental distress and the 

 altered behavior of rabies. 



"Fear of water" is a pure hypothesis so far as the 

 dog is concerned, nor, in the absence of paralysis, is there 

 necessarily any difficulty in swallowing from spasm of the 

 muscles concerned. The history and the entire assem- 

 blage of symptoms must be the basis for diagnosis. 



The par aly tie form of rabies {dumb rabies) is more in- 

 sidious in its attack. There is not usually any excitement, 

 but very soon after the onset of the disease, manifested by 

 listlessness, the muscles of mastication become paralyzed, 

 so that the lower jaw drops. There is no maniacal stage. 



These forms do not constitute distinct diseases, and 

 both may occur at the same time in the one kennel. In a 

 word, the variations in the disease rabies are wholly de- 



B^o. 26.— Representation of a Dog supFSRiNa from Paralytic Rabies 



(after Sanson). 



pendent, so far as known now, on the amount of the 

 poison introduced into the animal, and on the latter's indi- 

 vidual peculiarities of constitution. 



