Result of Crossing Round with Wrnkled Peas, etc. 128 
00213 mm. These measurements are accurate to 2 pw. The length-breadth 
index (z.., 100 x breadth-length) is 66°14. The above figures were calculated 
from a series of measurements of 232 grains. 
Fia. 1.—Starch-grains of Round Pea (p-grains). 
Beside the large potato-shaped grains which have just been described there 
are always found associated with them extremely few very much smaller 
grains which are round. Two of these are shown in fig. 1. These small 
round grains occasionally exhibit traces of division, as in the case of the third 
small grain shown on fig. 1.. The division does not affect the contour of the 
grain and I have not found a small grain divided into more than two sub- 
divisions. 
The Starch-grains of the Wrinkled Pea. 
The starch-grains in a wrinkled pea like “ British Queen ” are, as shown in 
fig. 2, immediately distinguishable from those of the round pea, by the fact 
that they are compound. They will be referred to for the sake of brevity as 
c-grains. Each grain consists of a number of pieces which varies between 
2 and 8. The separate pieces are loosely held together by a refringent yellow 
substance which, from the fact that it does not stain blue with iodine, appears 
to be of a different nature from the pieces themselves. 
These grains are very liable, as Gregory pointed out, to break up into their 
component pieces. I do not propose to go into the question of the relation 
between the number of component pieces and the size of a grain. Suffice it 
to say that the examination of a large number of samples reveals a rough 
