1907 .| Wrinkled Peas, and their resultant Starch-grains. 125 
a The Starch-grains of the Hybrid. 
For the examination of the characters of the grains of F, cotyledons I had, 
unfortunately, only two seeds left from a number of crosses between “ British 
Queen” and “Eclipse” which Mr. J. T. Wadsworth made for me in the 
summer of 1905.* All the rest had been sown: the plants bearing the Fs 
cotyledons raised from them are now in flower. 
The starch-grains in the F, cotyledons produced by crossing a round with 
a wrinkled pea are not like those of the round pea, as might have been 
expected from the fact that round is dominant over wrinkled, but are inter- 
mediate between those of the round and those of the wrinkled pea. 
In the first place they are nearly round (see fig. 4), and will on this account 
and for brevity’s sake be referred to as 7-grains. 
Fig. 4.—Starch-grains of F, cotyledons (7-grains). 
In the second place, whilst the majority of the grains in the F; seeds are 
single the remainder are compound. In a count of 579 grains, 356 were 
single, 223 were compound. In the third place the degree of compound- 
ness exhibited by the compound grains in F, seeds is intermediate between 
* For the nature of the starch grains in other crosses between round and wrinkled 
peas, see pp. 132, 133. 
