172 A Defence of Mendel's 



fluctuations instead of specific phenomena*. Therefore 

 when Correns using "yellowish white" obtained one result 

 and Nobbe using "white" obtained another, Professor 

 Weldon hurries to the conclusion that the results are 

 comparable and therefore contradictory. Correns however 

 though calling his flowers gelblick-weiss is careful to state 

 that they are described by Haage and Schmidt (the seed- 

 men) as " schwefel-gelb" or sulphur-yellow. The topics 

 Professor Weldon treats are so numerous that we cannot 

 fairly expect him to be personally acquainted with all ; 

 still had he looked at Stocks before writing, or even at the 

 literature relating to them, he would have easily seen that 

 these yellow Stocks are a thoroughly distinct form! ; and 

 in accordance with this fact it would be surprising if they 

 had not a distinctive behaviour in their crosses. To use 

 our own terminology their colour character depends almost 

 certainly on a compound allelomorph. Consequently there 

 is no evidence of contradiction in the results, and appeal to 

 ancestry is as unnecessary as futile. 



2. Datura. As for the evidence on Datura, I must 

 refer the reader again to the experiments set forth in our 

 Report. 



The phenomena obey the ordinary Mendelian rules with 

 accuracy. There are (as almost always where discontinuous 



' See also the case of Buchsbaum, p. 146, which received similar 

 treatment. 



t One of the peculiarities of most double " sulphur " races is that 

 the singles they throw are white. See Vilmorin, Fleurs de pleine 

 Terre, 1866, p. 354, note. In Wien. III. Gartenztg. 1891, p. 74, 

 mention is made of a new race with singles also "sulphur," cp. 

 Gartenztg. 1884, p. 46. Messrs Haage and Schmidt have kindly 

 written to me that this new race has the alleged property, but that 

 six other yellow races (two distinct colours) throw their singles white. 



