Principles of Heredity 169 



D. Miscellaneous cases in other plants and animals. 



Professor Welclon proceeds : 



" In order to emphasize the need that the ancestry of the 

 parents, used in crossing, should be considered in discussing the 

 results of a cross, it may be well to give one or two more ex- 

 amples of fundamental inconsistency between different competent 

 observers." 



The " one or two " run to three, viz. Stocks (lioariness 

 and colour) ; Datura (character of fruits and colour of 

 flowers) ; and lastly colours of Rats and Mice. Each of 

 these subjects, as it happens, has been referred to in the 

 forthcoming paper by Miss Saunders and myself. Datura 

 and Matthwla have been subjected to several years' experi- 

 ment and I venture to refer the reader who desires to see 

 whether the facts are or are not in accord with Mendel's 

 expectation and how far there is " fundamental inconsist- 

 ency " amongst them to a perusal of our work. 



But as Professor Weldon refers to some points that 

 have not been explicitly dealt with there, it will be safer 

 to make each clear as we proceed. 



1. Stocks (Matthiola). Professor Weldon quotes 

 Correns' observation that glabrous Stocks crossed with 

 hoary gave offspring all hoary, while Trevor Clarke thus 

 obtained some hoary and some glabrous. As there are 

 some twenty different sorts of Stocks* it is not surprising 

 that different observers should have chanced on different 

 materials and obtained different results. Miss Saunders 



* The number in Haage and Schmidt's list exceeds 200, counting 

 colour-varieties. 



