1907.] Wrinkled Peas, and their resultant Starch-grains. 129 
is not due to a difficulty to distinguish between 7- and p-grain—even if it 
were possible for anyone familiar with these grains to have this difficulty—is 
shown by the fact that all peas containing grains falling into this category 
were borne by heterozygote plants, a fact which was not known when the 
grains were being examined. Table III gives the details of these families 
and fig. 6 shows some of the r-grains. ; 
Table ILI. 
Number and characters of 
seeds borne by parent-plant. | Character of Nature of starch-grains in each 
Catalogue- Bes of of these seeds. 
ae t Colour. Shape. Bice oT 
ee ate for starch- F 
grains. 
Ye G. R. We. re | i. ill, Iv. v. 
54. 3 28 4, 22 9 5 round r sc p p p 7 SC 
54. 18 20 9 , 6 i r sc p FSC || FSC.) .7-Se 
54. 19 31 12 31 12 D 1p r sc p p 
54. 23 26 6 22 6 5 rme|rme|rme|rme | rme 
54, 33 26 10 26 9 ; a rmc;rme|rme| op fe 
54, 52 33 13 30 13 . 4 SC p Pp p Tr SC 
54. 57 23°) 8 21 10 i tse | tse | tse | tse |’ ise 
54. 65 20 3 15 8 ; p Tr fe p tse p 
54. 77 30- 9 35 2 ¥3 p rfe| rfe| rfe| p 
54. 89 32 9 29 8 > ese | ife | rse p r se 
54.105 32 8 27 13 = ime |ime | rme|rme | ime 
54.112 27 6 16 5 % p i fe Pp p p 
54.121 19 4 21 2 " p p rme| pfe| pfe 
54,146 15 4, 14 5 Bs p Pp p p r me 
54.150 18 6 17 7 ; rse | rse p p p 
54.177 26 Zz 25 8 Ee rme| rse | rse | rse | rse 
54.179 37 4 38 2 . ife |ime | pfe| pfe | rme 
54.180 36 11 38 9 <3 p p fe be | Dye |p ve 
54.181 38 9 36 i rs TASC UN Se eepipe | nese safe 
54.182 37 9 30 13 4 aCe eerie: Nu fc in aton lea he 
ry = round grains (fig. 6). me = many compound. 
@ = irregular round. Other symbols as in Table IT. 
se = some compound, 
The difference between peas marked 7 mc and those marked 7 fc is some- 
times very great. A count of 508 grains from a pea marked r me revealed 
203 compound and 305 single. Whilst in a pea marked 7 fc, there were only 
28 c-grains in 304 counted. 
In the absence of any information as to the behaviour of the characters of 
the grains in F, it is not possible to make any definite statement as to the 
mode of segregation in this case; but the following points seem to be cleav.. 
We have seen that the grain in the F, seed is round. The evidence points 
to the fact that the heterozygote round peas in subsequent generations are 
characterised by the possession of 7- or r-grains and homozygote rounds by 
