When two species are crossed, one has sometimes a prepotent power of impressing its likeness on the hybrid.

So I believe it to be with varieties of plants; and with animals, one variety certainly often has this prepotent power over another variety.

Hybrid plants produced from a reciprocal cross generally resemble each other closely, and so it is with mongrel plants from a reciprocal cross.

Both hybrids and mongrels can be reduced to either pure parent form, by repeated crosses in successive generations with either parent.