Part 2 — Notes to Chapter XXIX.
Reading edition
The student should read Bailey, The Nursery Book, 1896, for details regarding the practice of grafting, and facts in abundance can be obtained from the pages of the Gardeners' Chronicle.
Concerning graft-hybrids and the variations of grafted plants see Jouin, Can Hybrids be obtained by Grafting? and especially Daniel, "La Variation dans la Greffe," in Ann. des Sc. Naturelles, S. VIII., Vol. 8, 1898, p. 1, and the literature there collected. The whole subject is largely controversial, and much work remains to be done.