Principles of Heredity 171 



On comparing Professor Weldon's version with the 

 originals we find the missing explanations. Having served 

 some apprenticeship to the breeding of Stocks, we, here, 

 are perhaps in a better position to take the points, but 

 it is to me perfectly inexplicable how in such a simple 

 matter as this he can have gone wrong. 



Note then 



(1) That Nobbe does not specify which colours he 

 crossed together, beyond the fact that white was crossed 

 with each fertile form. The crimson form (Karmoisinfarbe), 

 being double to the point of sterility, was not used. There 

 remain then, white, carmine, and two purples (violet, "dark 

 blue "). When white was crossed with either of these, 

 Nobbe says the colour becomes paler, whichever sort gave 

 the pollen. Nobbe does not state that he crossed carmine 

 with the purples. 



(2) Professor Weldon gives no qualification in his 

 version. Nobbe however states that he found it very 

 difficult to distinguish the result of crossing carmine with 

 white from that obtained by crossing dark blue or violet 

 with white*, thereby nullifying Professor Weldon's state- 

 ment that in every case the cross was a simple mixture of 

 the parental colours a proposition sufficiently disproved by 

 Miss Saunders' elaborate experiments. 



(3) Lately the champion of the " importance of small 

 variations," Professor Weldon now prefers to treat the 

 distinctions between established varieties as negligible 



* " Es ist sogar sehr sclncierig, einen Unterschied in der Farbe der 

 Kreuzungsprodukte von Karmin und Weiss gegeniiber Dunkelblau oder 

 Violett und Weiss zu erkennen." 



