AUTOBIOGRAPHICAL SKETCH. 151 



ger was a careful, minute, persevering observer, 

 as well as a deep thinker ; but he was as indo- 

 lent with his pen as he was industrious with 

 his brain. He gave his intellectual capital to 

 his pupils without stint or reserve, and noth- 

 ing delighted him more than to sit down for 

 a quiet talk on scientific matters with a few 

 students, or to take a ramble with them into 

 the fields outside the city, and explain to them 

 as he walked the result of any recent in- 

 vestigation he had made. If he found him- 

 self understood by his listeners he was satis- 

 fied, and cared for no farther publication of 

 his researches. I could enumerate many works 

 of masters in our science, which had no other 

 foundation at the outset than these inspiriting 

 conversations. No one has borne warmer tes- 

 timony to the influence Dollinger has had in 

 this indirect way on the progress of our sci- 

 ence than the investigator I have already 

 mentioned as his greatest pupil, — von Baer. 

 In the introduction to his work on embryol- 

 ogy he gratefully acknowledges his debt to 

 his old teacher. 



" Among the most fascinating of our pro- 

 fessors was Oken. A master in the art of 

 teaching, he exercised an almost irresistible 

 influence over his students. Constructing the 



