24 THE LIFE OF PASTEUR 



been lost, but his biography continues without a break, thanks 

 to the letters of his father. " Tell us always about your studies, 

 about your doings at Barbet's. Do you still attend M. Pouillet's 

 lectures, or do you find that one science hampers the other? 

 I should think not; on the contrary, one should be a help to 

 the other." This observation should be interesting to a student 

 of heredity ; the idea casually mentioned by the father was to 

 receive a vivid demonstration in the life-work of the son. 



