OF THE OX. 65 



the neighbourhood of Odessa, at the Heridin 

 farm, by Professor Jessen. 



The first inoculative attempts were very 

 fatal ; they caused the death of all the inocu- 

 lated animals. But it was soon perceived 

 that these grievous results, far from pre- 

 judicing the theory, really confirmed it; and 

 that the virus, attenuated in its toxical pro- 

 perties, would prove as effectual as was ex- 

 pected. And truly, in 1854 and 1855, at the 

 Dorpat establishment, the inoculations made 

 with a better selected virus afforded results less 

 disastrous. At Kozau they were still more 

 satisfactory. In fine, passing from experiment 

 to experiment, they arrived at the conclusion 

 that it was necessary to inoculate several 

 heads of cattle, the one after the other, with- 

 out having recourse to any other virus than 

 the first inoculated, so that they might thereby 

 obtain virus of the 2nd, 3rd, 4th, 5th, and up 

 to the 10th generation. The virus thus 

 attenuated in its morbid effects answered at 

 length every experiment, and oxen thus inocu- 

 lated could mingle with impunity with diseased 

 cattle. 



At the veterinary establishment of Chalkoff 



