532 POPULAR SCIENCE MONTHLY 



livery was usually cold and calculating; and yet in some moments he 

 could arouse, through his own deep earnestness, the highest enthu- 

 siasm among his students for the subject whereof he spoke — an en- 

 thusiasm, the fruits of which have been well shown by the works of 

 the many students, afterwards famous, who received their first impetus 

 from contact with Miiller during his periods at Bonn and at Berlin. 



In this regard, it is almost needless to say that Miiller's position 

 in Berlin resulted in a powerful influence over the younger natural 

 scientists, especially in the northern part of Germany. His person- 

 ality, as we have seen it, was one to attract students and to hold them 

 when once they knew him well. He planned for them, and often 

 accompanied them on many student trips throughout Germany and 

 even into Norway and Sweden for the purpose of extending various 

 phases of their biological study. In spite of his apparent coldness 

 and constraint, he was, as DuBois Beymond has said, always a ready 

 " comerade," and his views, his books, his apparatus of all kinds, were 

 ever willingly shared with all who desired them. 



To the same degree in which Miiller was independent in his 

 thought and work, he desired this quality in his students. In his 

 relations with them, notwithstanding his thorough friendliness, it 

 appears that in the laboratories Miiller would seldom enter into an 

 ordinary conversation. Begarding this point, DuBois Beymond says 

 in his " Geddchtnissrede," " The greatest reward for us students was 

 when Miiller relaxed and spoke in common conversation along the 

 lines of highest pleasantry." Even before his fame as a leader in 

 the field of natural science had gone abroad, and while dependent upon 

 his worth as a teacher alone, he had constantly at his side a circle of 

 eager students who clung to him with enthusiasm. Gathered about him 

 in the earlier days at the University of Bonn, before he went to Berlin, 

 one finds such men as Claparede, Haeckel, Lachmann, Lieberkuhn, 

 Anton Schneider and Max Schultze. Upon his departure to Berlin 

 in 1833, many of his students of the Bonn period followed him, and 

 one need only mention the names of Haeckel, Ludwig, Bischoff, 

 Schultze, Volkmann, Briicke, Helmholtz, Virchow and DuBois Bey- 

 mond, to indicate the immeasurable significance which, as a teacher 

 and leader of the young investigators of that time, Miiller must have 

 exercised. The lines of work which he established, his disciples and 

 followers have carried out, and to what extent, we all realize — not as 

 royal inheritors of that vast sovereign power of their master, but, we 

 may say, as governors over the smaller territories into which, like the 

 empire of Alexander, the field of natural science became divided after 

 the death of its last great ruler. Of this famous group of students, 

 now Haeckel alone remains, DuBois Beymond having died in 1896. 

 Yet all these men, at some period of their lives, have rendered grateful 



