Recent Advances in the Study of Heredity. 325 
union of these two types is 100%, which is a fairly close approxi¬ 
mation to intermediateness. I do not mention these two points of 
difference as being two distinct characters in which the hybrid 
round is intermediate between its two parents; on the contrary I 
Fig. 3. Starch Grains of a Hybrid Round Pea. 
[I wish to express my thanks to the Council of the Royal Society 
for permission to reproduce this figure.] 
imagine that the absorptive capacity and the structure of the 
grains are very intimately connected. 
We see therefore that in the case of the very first character 
dealt with in Mendelian investigation, that which we took, from an 
examination of externals, to be an instance of simple dominance, 
