[88] M. Carrière has lately described in the ‘Revue Horticole,’ (Dec. 1st, 1866, p. 457,) an extraordinary case. He twice inserted grafts of the Aria vestita on thorn-trees (épines) growing in pots; and the grafts, as they grew, produced shoots with bark, buds, leaves, petioles, petals, and flower-stalks, all widely different from those of the Aria. The grafted shoots were also much hardier, and flowered earlier, than those on the ungrafted Aria.
[89] ‘Transact. Hort. Soc.,’ vol. ii. p. 160.
[90] For the cases of oaks see Alph. De Candolle in ‘Bibl. Univers.,’ Geneva, Nov. 1862; for limes, etc., Loudon’s ‘Gard. Mag.,’ vol. xi. 1835, p. 503.
[91] For analogous facts, see Braun ‘Rejuvenescence,’ in ‘Ray Soc. Bot. Mem.,’ 1853, p. 320; and ‘Gardener’s Chronicle,’ 1842, p. 397; also Braun in ‘Sitzungsberichte der Ges. naturforschender Freunde,’ June, 1873, p. 63.
[92] ‘Journal of Hort. Soc.,’ vol. ii. 1847, p. 100.
[93] See ‘Transact. of Hort. Congress of Amsterdam,’ 1865; but I owe most of the following information to Prof. Caspary’s letters.
[94] ‘Nouvelles Archives du Muséum,’ tom. i. p. 143.
[95] See on this head, Naudin, ibid., p. 141.
[96] Braun, in ‘Bot. Mem. Ray. Soc.,’ 1853, p. 23.
[97] This hybrid has never been described. It is exactly intermediate in foliage, time of flowering, dark striæ at the base of the standard petal, hairiness of the ovarium, and in almost every other character, between C. laburnum and alpinus; but it approaches the former species more nearly in colour, and exceeds it in the length of the racemes. We have before seen that 20·3 per cent of its pollen-grains are ill-formed and worthless. My plant, though growing not above thirty or forty yards from both parent-species, during some seasons yielded no good seeds; but in 1866 it was unusually fertile, and its long racemes produced from one to occasionally even four pods. Many of the pods contained no good seeds, but generally they contained a single apparently good seed, sometimes two, and in one case three seeds. Some of these seeds germinated, and I raised two trees from them; one resembles the present form; the other has a remarkable dwarf character with small leaves, but has not yet flowered.