400 BIOLOGY AND ITS MAKERS 
was graduated at Géttingen in 1856, and for a short time 
thereafter engaged in the practice of medicine. This line of 
activity did not, however, satisfy his nature, and he turned 
to the pursuit of microscopic investigations in embryology 
Fic. 1r4.—Aucust WEISMANN, Born 1834. 
Permission of Charles Scribner’s Sons, 
and morphology, being encouraged in this work by Leuckart, 
whose name we have already met in this history. In 1863 
he settled in Freiburg as privat-docent, and has remained 
connected with the university ever since. From 1867 onward 
