WHITE— STUDIES OF INHERITANCE IN PISUM. 629 



cent, more water than smooth peas, and it is largely because of this 

 greater water loss that the wrinkled condition of the cotyledons and 

 seed coat is brought about and not because of difference in sugar 

 content as contended by Darbishire (19). Difference in sugar con- 

 tent from the writer's knowledge of pea varieties, is probably very 

 variable. Correlated with the larger water content of unripe 

 wrinkled peas is a larger water content of their leaves as compared 

 with leaves of smooth seeded varieties. 



Seed of wrinkled varieties of peas as compared with smooth 

 seeded peas, usually lose their power of germination and rot more 

 quickly under unfavorable conditions, such as cold, wet weather. 

 Wrinkled peas are a shade lighter in cotyledon color than smooth 

 peas from the same pod or plant and grown under the same en- 

 vironmental conditions. 



Varieties Studied. 



Because of the large number of genetic experiments on these 

 characters, only a partial list of the varieties studied can be given. 



Smooth Round. 



Eclipse, Genoa round, P. arv. hibernicum, Bohnenerbse, Sangster's 

 No. I ( ?) — Darbishire (19). 



Express, Fillbasket, Tres nain de Bretagne, Carter's Telegraph, Vic- 

 toria ]\Iarrow, Maple — Gregory (37). 



Express, Tres nain de Bretagne, Victoria ^Marrow, Blue Peter, Fill- 

 basket — Bateson & Kilby (i). 



Ceylon Native No. i. Ringleader, Ceylon Native No. 2, Sutton' i 

 Telegraph ( ?) — Lock (54). 



Laxton's Vorbote, Emerald Gem, Carter's First Crop — Kappert 



(48). 

 Harrison's Early Eclipse — Hurst (42). 



Emerald, Yellow Pod Sugar Pea and numerous others — Tschermak. 

 Over 20 varieties (unpublished data) — White. 



Indent. 



Purple fl. Field Pea, Purple Sugar Pea, Sutton's Purple Podded Pea 

 —Gregory {z?)- 



