134 Mr. A. D. Darbishire. On Crossing Round with [June 20, 
capacity. The uppermost dot in a column gives the absorptive capacity of 
the round parent in a cross: the lowermost dot, that of the wrinkled parent. 
and the intermediate one, that of the hybrid. The absorptive capacity is, in 
every case, except in that of the round parent in M 299, calculated from: 
weighings made with the actual variety of round or wrinkled pea utilised in 
the cross ; and, indeed, in many cases from the seeds from the very plant which 
served as mother or father. Instead of the absorptive capacity of the actual 
round parent in M 299 is written the average of the values for the five 
different varieties of round peas we have dealt with. 
Table VIII gives the parentage of the crosses summarised in Table VII. 
Table VIII. 
| | v 
Catalogue- | Number Number pene 
number of Wrinkled parent. | of seeds Round parent. | of seeds f ee = 
cross. | weighed. | weighed. | °° tk | 
| weighed. 
a 2 British Queen ...... los oa Buichipsed se. ce ee ae 1 
M 8 2 Laxton’s Aipha | 5 3 Sangster’s No. 1...... 4, 1 
(Haage & Schmidt) | 
M 238 7) Fr rs | 5 6 Yellow  round* sy) 1 
(Genoa) 
M 29 2 Laxton’s Alpha | 8 3 45 a 9 if | 
(Sutton) | | 
M 67 2 x: 3 | 8 6 Bohnenerbset 3 1 | 
| (Haage & Schmidt) | 
M 96 3d Laxton’s Alpha | 5 2 Yellow round 9 6 | 
(Haage & Schmidt) | (Genoa) | 
M 137 2 Telephone (Haage & 3 3 Pisum  arvenset 6 1 
Schmidt) | hibernicum | 
M 299 2? British Queen ...... ee alia $ Maple from vide text 2 | 
| Mr. R. H. Lock | 
* Plants grown from (evidently unimported) yellow seeds which I bought in a small shop- 
in Genoa. 
+ A large, long pea with a black hylum, which, however, is not situate in the middle of one side 
as in the bean, but at the end. 
{ Pisum arvense hibernicum is a small pea seldom attaining 2 feet in height, though it is not. 
dwarf in habit, sold by Messrs. Haage und Schmidt (No. 1660, p. 30, 1907 Catalogue). Its seeds 
can be sorted into four categories. Maple and purple spots on grey : maple on grey; purple spots 
on grey, and grey. Vide “ Report II to Evolution Committee of Royal Society,” and R. H. Lock,. 
‘Roy. Soc. Proc.,’ B, vol. 79, supra, p. 28. 
Summary. 
My investigations on this subject are being continued. The facts so far 
brought to light are :— 
1. That, although roundness is dominant over wrinkledness in peas, the: 
starch-grain of the F, generation (the round or r-grain—fig. 4) is a blend 
between the type of grain of the round pea (the potato-shaped or p-grain—- 
