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 at, by the officers of Captain Parry's voyage, 183

Memecylon belongs to Melastomaceæ, 118

Menzies, Archibald, plants collected by him at King George's Sound, 6

Mesembryanthemum, arrangement of ovules in many species of, 556

Microscopical observations on the particles contained in the pollen of plants, and on the general existence of active molecules in organic and inorganic bodies, 463, 486; lenses used in the observations, 465 note, 480

Mimoseæ, observations on the order, and on its distribution in Terra Australis, 22; species found in the vicinity of the Congo, 110; species found in Central Africa, 288

Mirbel, MM. de, and Spach, memoir on the development of the embryo in Coniferæ, by, 572-3

Mitchell, Sir Thomas, plants collected by, in the interior of Australia, 315, 339

Molecules, active, on the general existence of, in organic and inorganic bodies, 463—486; in the grains of pollen of Clarckia pulchella, and other plants of the order Onagrariæ, 467, and in many other families of Phænogamous plants, 468; in Asclepiadeæ, ibid.; in Gramineæ, 468 and note; in Periploceæ, Apocineæ, and Orchideæ, 469; motion continued long after the death of the plant, 469; in the supposed stamina of Mosses and Equisetum, 469-70; in all organic tissues, animal or vegetable, living or dead, 470-1; in various products of organic bodies, recent and fossil, 471; in inorganic bodies of all kinds, 471-2; not affected by intense heat, 473; combinations of, forming fibrils, 473; their form, 473-4; whether of uniform size, 473-4, 480; substances from which they had not been obtained, 475; not stated to be animated, 478; nor to agree in all their properties and functions, 480; general result of the inquiry, 481; supposed causes of motion examined, 481—483; molecular motion confounded with animalcular by Leeuwenhoek and by Stephen Gray, 483; by Needham and Buffon, 483-4; observed by Gleichen, Wrisberg, Müller, Dr. James Drummond; observations on Mr. Bywater's microscopical observations, 485

Monocotyledons, difficultv of defining several of the orders of, and secondary characters consequently employed for that purpose, 52

Monodora myristica, probably introduced into the West Indies from Africa, 162

Moringa appears to form an insulated genus or family, Moringeæ, 204

Mosses, observations on the parts of fructification in, 313; Hedwig's account of the sexes in, maintained, 345; Palisot de Beauvois's theory of, controverted, ibid.; examination of the ripe capsule in Funaria hygrometrica, 347; and in other species, 348

Musa, observations on the structure of the flower in the genus, 157 note

Musanga, a genus of Artocarpeæ, observations on its structure and affinities, 138

Myoporinæ, observations on the order and on its distribution in Terra Australis, 40, 339

Myrianthus, a genus of Artocarpeæ, observations on its affinities and structure, 138

Myrsineæ, not yet met with in equinoctial Africa, 150

Myrtaceæ, observations on the order and on its distribution in Terra Australis, 18

Mystropetalon, a new and remarkable genus of Balanophoreæ, 414 and note

Myzodendron, nearly related to Loranthaceæ, 413 note; peculiarities of its vascular tissue, ibid.; and in the structure of its flower and fruit, ibid.

Myzodendreæ, a sub-order or tribe of Loranthaceæ, 413 note; approaches Santalaceæ, ibid.