HISTORIC DEVELOPMENT OF IMMUNOLOGY 27 



was established and the procedure generally in- 

 troduced. 



Pasteur's Achievements Further advances 

 in immune therapy were not made until Pas- 



Charles Robert Darwin (1809-82). 



teur's work, nearly a century later. From his 

 studies on experimental infections, based on 

 Jenner's observation that immunity to small- 

 pox could be produced by attenuated virus, Pas- 

 teur concluded that this might be a general law 



