Note 36 — EXPERIMENTS IN PLANT-HYBRIDISATION23.

[This statement of Mendel’s in the light of present knowledge is open to some misconception. Though his work makes it evident that such varieties may exist, it is very unlikely that Mendel could have had seven pairs of varieties such that the members of each pair differed from each other in only one considerable character (wesentliches Merkmal). The point is probably of little theoretical or practical consequence, but a rather heavy stress is thrown on “wesentlich.”]