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600 the more general arrangement, 292; admits of many exceptions, ibid.

Foramen of the testa infallibly indicates the place of the future radicle, 264, 446; observed in Rafflesia, 406; in Hydnora, 407

Franklandia, observations on the genus, 81

Fraser, Charles, his report on the botany of Swan River, and collections formed there by him, 307, 338

Fruits, indigenous fruits of Western Africa, 155

Fruits and seeds, on some remarkable deviations from the usual structure of, 357

Fuirena umbellata, identity of African and American specimens, 169

Gaudichaud, specimens of the caudex of a species of Xanthorrhoea, brought by him from Port Jackson, 439

Genera, geographical distribution of, a clue to the native country of plants now generally dispersed, 149, 156

Gentianeæ, only one species in the collection from Central Africa, 295; position of their carpels, 562

Geraniaceæ found in Central Africa, 288

Glands on the receptacle in several genera of Cruciferæ, their number and position, 267; cutaneous (stomata) found on both surfaces of the leaves and foliaceous footstalks of the genus Eucalyptus, and of the leafless Acaciæ, and assisting to give a peculiar character to the Australian forests, 312; generally found on the under surface only, ibid.; rarely, as in several Coniferæ, only on the upper, ibid.

Gleichen, his description of the organs and mode of fecundation in Asclepiadeæ, 516-7.

Gloriosa, observations on the genus and on the identity of African and Indian specimens, 170

Glycine subterranea, probably of African origin, 160

Gnetum, the ovulum naked in, 453; structure of the nucleus in, 455

Goodenoviæ, observations on the order, and its distribution in Terra Australis, 31; comparison with Lobelia, 32; pollen of, remains long quiescent, 33, 575

Gramineæ, observations on the order, and its distribution in Terra Australis, 54; proportion of the order to Monocotyledons, ibid.; subdivisible into two great tribes, Poaceae and Paniceæ, 55-8; structure of the flower and analogy of its parts, 55-6; further observations on the order, and on its proportions and geographical distribution, 145; on the species found in the vicinity of the Congo, 146; in Central Africa, 288, 300; proportion of the two great divisions in the collection from Central Africa, ibid.; stigmata of, 559

Grammitis Ceterach, the only fern in Mr. Ritchie's collection from the neighbourhood of Tripoli, 303

Griffith, William, his "attempt to analyse Rhizantheæ," 423

Gulf-weed, on the origin and propagation of the, 577—582; whether originally destitute of roots, 581; existence of dots in, 583

Gunn, Ronald, plants collected by, in Van Diemen's Land, 338

Habenaria bifolia, monstrosity of, unfavorable to the theory of the auriculæ of the column representing lateral stamina, 500; H. viridis, mucous tubes inserted into the aperture of ovulum in, 540 note.

Halorageæ, observations on the order and on its distribution in Terra Australis, 21

Hibbertia volubilis, its arillus, 449

Hibiscus tiliaceus, identity of specimens from the Congo and from India, 171

Hippocraticeæ, observations on the order and on the species found in the vicinity of the Congo, 107

Holcus, a cultivated species of, on the banks of the Congo, probably indigenous, 160

Homalinæ, characters of the order, and observations on the species found in the vicinity of the Congo, 120