WHITE— STUDIES OF INHERITANCE IN PISUM. 521 



epistatic to yellow and thus masks it. Yellow cotyledon color is 

 apparently the ancestral color of all our peas, as all the wild species 

 of Pisum have only yellow cotyledons. 



Varieties Studied. 



No attempt will be made to give a list of all the varieties upon 

 which genetic studies of cotyledon color have been made. Suffi- 

 cient to say that at least a hundred are involved and these have been 

 collected from all over the globe wherever peas are grown. 



Orange Yellozv to Ycllozv. 



Tres nain de Bretagne, Debarbieux, Sabre, Victoria Marrow, 

 British Queen, Early Giant, Purple Sugar Pea — Bateson (i). 



Ceylon Native Pea Nos. i and 2, Ringleader, French Sugar Pea 

 — all Lock (54). 



Purpurviolettschottigen Kneifelerbse, Bohnenerbse — Correns 



(14). 



Grau Riesen, Desirat, various Svalof P. arv. nos., Victoria, 

 Couturier, Auvergne, Buchsbaum, Prince of Wales — Tschermak 

 (79, 80, 81, 83). 



Black-eyed Marrowfat, First of All, Spate Gold, Petit Pois, Wachs 

 Schwert, Mummy, White Marrowfat, Elephanten, Abyssinian Black, 

 P. clatius, Gold von Blocksberg — White (98). 



Light Yellow. 



Goldkonig, P. humile ? of Sutton — White (98) ; Satisfaction — 

 Lock (54). 



Dark Green to Green. 



Fillbasket, Express, Blue Peter — Bateson (i) ; Nonsuch, Earliest 

 Blue, Eclipse — Lock (54) ; Gritnen Erfurter Folger — Correns (14) ; 

 Griinbl. Folger, Express, Greenseeded P. satk'uni of Svalof, 

 Serpette, Plein le Panier, Blue Peter, Fairbeard's Champion — 

 Tschermak (79, 80, 81, 83). 



Market Split Pea of New York City, Acacia, Velocity, Alaska, 

 Scotch Beauty, Express, Nott's Excelsior, Laxtonian — White (98). 



