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Strasburger felt keenly the attack made upon him on account of 

 his paper on graft hybrids. He felt it beneath his dignity to reply, but 

 in a letter of January 6, 1910, he says: "I had the position to defend 

 which I have held in regard to the role of the nucleus in fertilization and 



Winkler 



That alone 



was responsible for my paper in the Berichte der deutschen botanischen 

 Gesellschaft." 



For some time he had known that his health was failing, but he had 

 continued to work, and his publications show that he was still in his 

 prune and that advancing years had only brought their experience and 

 power without weakening his initiative or enthusiasm in research. At 

 the time of his death, he was deeply interested in the problem of the 

 determination of sex and had investigations under way bearing upon 

 this important subject, but was being delayed by another piece of work. 

 In a letter of March 5, 191 1, he writes: 



Unfortunately, I have not got to my microscopic work this winter. A year 

 ago I saw myself necessitated to take part in a scientific publication of preten- 

 tious scope, bearing the name Kultur der Gegenwart, which is to present in 

 accessible form the whole field of science. The plan may be good in itself, but 

 I have often deplored that I allowed myself to undertake the work and that I 

 must devote to it, rather than to my own research, the few years of scientific 

 activity which still remain for me. Besides, I have not felt well this winter, 



