HYDROPHOBIA 



257 



incubation decreases from three weeks to six days, but beyond 

 this the period does not become less, and the degree of virulence 

 from the virus lead Pasteur to name it virus fixe (fixed virus). 



Passing the virus through foxes, cats, and wolves also intensifies 

 the virulence, while monkeys and chickens attenuate it. 



FIG. 81. Section through the cornu ammonis of brain of a rabid dog; 

 lined by the method of Lentz. Five Negri bodies of different sizes are 

 >wn, enclosed within the ganglion cells. The smallest contains only three 

 tiute granules. (After Lentz, Centralbl f. Bakt., 1907, Abt. I, Vol.XLIV, 

 > 378.) 



Negri bodies, intracellular bodies discovered by Negri, are 

 >und in the ganglionic cells of rabid animals. These bodies stain 

 >y eosin, and are from i to 27;* in size, being generally about s/x. 



