HYDROPHOBIA, OR RABIES. 389 



1 : 6000, 1 : 5000, 1 : 2000, 1 : 1000, 1 : 500, 1 : 250, 1 : 200, 

 1 : 100, and finally the full strength, 1 : 10. 



Cabot 1 prepared a stock solution of 8 parts of rabbit's 

 brain and 80 parts of glycerin and water. The quantity 

 of glycerin added comprised one-fifth of the total bulk. 

 After the emulsion was made, it was filtered through 

 sterile cheese-cloth. This emulsion containing the glyc- 

 erin, if kept in the ice-chest, will be of standard viru- 

 lence during the entire period of immunization. As the 

 result of his experimentation, Cabot finds that the dilu- 

 tion-method is attended with some danger to the animal 

 immunized, which is not present in the dried-cord method 

 of Pasteur. The latter method, therefore, is the one to 

 be preferred. 



1 Journal of Experimental Medicine, 1899, vol. iv., No. 2. 



