No. H. M. 1 8 46 A.M. 2 10 0 3 11 0 4 11 37 5 12 7 P.M. 6 12 30 7 1 0 8 1 30 9 1 44 10 2 25 11 3 0 12 3 30 13 3 48 14 4 40 15 5 5 16 5 25 17 5 50 18 6 25 19 7 0 20 7 45 21 8 30 22 9 15 {118} ‘Leçons de Botanique,’ &c., 1841, p. 170. {127a} I am indebted to Prof. Oliver for information on this head. In the Bulletin de la Société Botanique de France, 1857, there are numerous discussions on the nature of the tendrils in this family. {127b} ‘Gardeners’ Chronicle,’ 1864, p. 721. From the affinity of the Cucurbitaceæ to the Passifloraceæ, it might be argued that the tendrils of the former are modified flower-peduncles, as is certainly the case with those of Passion flowers. Mr. R. Holland (Hardwicke’s ‘Science-Gossip,’ 1865, p. 105) states that “a cucumber grew, a few years ago in my own garden, where one of the short prickles upon the fruit had grown out into a long, curled tendril.” {145} Trans. Phil. Soc. 1812, p. 314. {146} Dr. M’Nab remarks (Trans. Bot. Soc. Edinburgh, vol xi. p. 292) that the tendrils of _Amp. Veitchii_ bear small globular discs before they have came into contact with any object; and I have since observed the same fact. These discs, however, increase greatly in size, if they press against and adhere to any surface. The tendrils, therefore, of one species of _Ampelopsis_ require the stimulus of contact for the first development of their discs, whilst those of another species do not need any such stimulus. We have seen an exactly parallel case with two species of _Bignoniaceæ_. {152} Fritz Müller remarks (ibid. p. 348) that a related genus, Serjania, differs from Cardiospermum in bearing only a single tendril; and that the common peduncle contracts spirally, when, as frequently happens, the tendril has clasped the plant’s own stem. {154} Prof. Asa Gray informs me that the tendrils of _P. sicyoides_ revolve even at a quicker rate than those of _P. gracilis_; four revolutions were completed (the temperature varying from 88 degrees-92 degrees Fahr.) in the following times, 40 m., 45 m., 38½ m., and 46 m. One half-revolution was performed in 15 m.