THE RADIOLAKIA . 99 



cation of his discoveries to his colleagues in the 

 zoological section of the Scientific Congress at 

 Konigsberg. Virchow was amongst his admiring 

 audience. On the 13th and the 20th of December 

 in the same year Peters read a short account in 

 the Berlin Academy of Science that drew more 

 general attention. He set to work on a fine 

 monograph, with splendid plates and with all his 

 conclusions in the text. Before it was finished, 

 however, he had a number of personal experiences 

 and changes of mind. Gegenbaur had in the 

 meantime been appointed Professor of Anatomy 

 at Jena. Before he started for Italy, Haeckel 

 had visited his friend at Jena during the cele- 

 bration of the third centenary of the university. 

 "We spent a very happy time there," Haeckel 

 wrote afterwards, "enjoying the beautiful pros- 

 pect (from the heights of the Saale valley) and 

 the Thuringian beef-sausages." Now there were 

 more serious things to discuss. Gegenbaur's lot 

 had once seemed to him a kind of model. Now 

 a part of it was fulfilled : he had been to Messina. 

 Meantime Gegenbaur had advanced a station. 

 Haeckel wanted to follow him, and get a position 

 at Jena. There was no such thing as a pro- 

 fessorship of zoology or a zoological institute 

 there, but all that might — nay, must — be changed 

 some day. What Gegenbaur was doing left 

 plenty of room for another chair to be set up. 

 And to be with his best friend 1 



In March, 1861, Haeckel completed the Disser- 

 tatio pro venia legendi at Jena that he had 



