The case was originally described in the "Philosophical Transactions," 1821, page 20.

For an account of recent work bearing on this question, see article on "Zebras, Horses, and Hybrids," in the "Quarterly Review," October 1899.

See Letter 235.), that the vibrations from the protoplasm, or "plasson," of the seminal fluid of the zebra set plasson vibrating in the mare; and that these vibrations continued until the hair of the second colt was formed, and which consequently became barred like that of a zebra.

How he explains reversion to a remote ancestor, I know not.

Perhaps I have misunderstood him, though I have skimmed the whole with some care.