COW-POX. 421 



from the hands of a milkmaid who had been infected The disease 

 was communicated, and with it the immunity which he expected. 

 He multiplied his experiments, and was successful in all of them ; 

 and, at length, established the power of vaccination, and proved him- 

 self to be one of the greatest benefactors to the human race that 

 ever lived. Some practitioners of no little eminence have recom- 

 mended (and perhaps it deserves more consideration than has been 

 given to it, a return to the primary fountain for a recruit of power 

 and energy, after the lapse of a certain period and the prosecution of 

 a certain number of successive experiments. 



