146 A Defence of Mendel's 



as "a yellow-seeded variety." Tschermak*, however, de- 

 scribes it as having " gelbes, ofters gelblich-grunes Speicher- 

 gewebe " (cotyledons) ; and again says the cotyledon-colour 

 is " aller dings gerade bei Buchsbaum zur Spontanvariation 

 nach gelb-grun neigend!' The (!) is Tschermak's. There- 

 fore Professor Weldon can hardly claim Buchsbaum as 

 " yellow-seeded ' : without qualification. 



Buchsbaum in fact is in all probability a blend-form 

 and certainly not a true, stable yellow. One of the green 

 seeds mentioned above grew and gave 15 yellows and three 

 greens, and the result showed pretty clearly, as Tschermak 

 says, that there had been an accidental cross with a tall 

 green. 



On another occasion Telephone ? (another impure 

 green) x Buchsbaum gave four yellow smooth and two green 

 wrinkled, but one [? both : the grammar is obscure] of the 

 greens did not germinate t. 



(3 b) Telephone cases. Telephone, crossed with at least 

 one yellow variety (Auvergne) gave all or some green or 

 greenish. These I have no doubt are good cases of 

 " defective dominance " of yellow. But it must be noted 

 that Telephone is an impure green. Nominally a green, it 

 is as Professor Weldon has satisfied himself, very irregular 

 in colour, having many intermediates shading to pure yellow 

 and many piebalds. It is the variety from which alone 

 Professor Weldon made his colour-scale. / desire therefore 

 to call special attention to the fact that Telephone, though 



* (36), p. 502 and (37), p. 663. 



t Professor Weldon should have alluded to this. Dead seeds 

 have no bearing on these questions, seeing that their characters may 

 be pathological. The same seeds are later described as " wie 

 Telephone selbst," so, apart from the possibility of death, they may 

 also have been self-fertilised. 



