BREUNNERITE in a native Carbonate of Magnesia and Iron. It occurs crystallised. Its primary form is an obtuse rhomboid. The cleavage perfect, parallel to the primary planes. Colour yellow of different shades, and black ; streak white ; fracture flat conchoidal ; hardness 4•0 to 4'5 ; its lustre is vitreous, sometimes inclining to pearly ; it is transparent and translucent Specific gravity 3.0 to 3/. Found at 7j1lerthal in Salzburg and other places In the Tyrol. It low been analysed by Strorneyer and contain* Carbonate of Magnesia . . . . . 86'05 Carbonate of Iron Carbonate of Manganese . . . . Blt EX IA'CE‘E, Bre.riods, the Brexia Tribe, a natural order of plants belonging to the polycarpoua group of Monopetalous Exogen& This order was constitnted by Lindley in the first edition of his Natural System of Plants.' The following is his description of the enter :— Calyx inferior, small, peraiattnt, 5-parted, motivation imbricated ; petals 5, hypogynous, imbricated in aestivation; stamens 5, hypogynoua, alternate with the petals, arising from a narrow cup, which is toothed between each stamen ; anthers oval, innate, 2-celled, bursting longi tudinally, fleshy at the apex ; pollen triangular, cohering by means of fine threads ; ovary superior, 5-celled, with numerous ovuloa attached in two rows to placentae in the axis ; style 1, continuous ; stigma simple ; fruit drupaceous, 5-celled, many seeded ; seeds indefinite, attached to the axis with a double integument, the inner of which is inembranoua ; no albumen ; cotyledons ovate, obtuse ; radicle cylin drical, centripetal. The species are trees with nearly single trunks ; the leaves are coriaccous, alternate, simple, not dotted, with deciduous minute stipules; the flowers are green, in axillary umbels, surrounded by bracts on the outside. -.
Dr. Lindley remarks that the habit of Bruria is that of sonic yrsinacem, especially of from which it differs in being polypetalous, and the stamens being alternate with the petals. Its relations are also strong with Rhemnacem and Celastraceer, but its stamens are hypogynous, and its seeds indefinite. Some resemblance to Anacardiame may be seen in the resinous appearance of the young shoots, and in its habit It agrees with Pittosporaceee in its hypogynous definite stamens, its polyspermons fruit, and alternate undivided leaves. There are three species of Brozia, all of them elegant trees with a fine foliage. They grow well in a mixture of turfy loam and peat; and cuttings with their leaves not shortened strike readily in sand under a hand-glass in heat, or a leaf with a bud attached will grow. The leaves are covered with a resinous matter which causes rain to run off them immediately, and thus induced Du Petit Thouare to give these plants the name of Brexia, from Bpitts, which signifies a wetting.' In gardens they ere commonly called Theophrastas, but they differ considerably from that genus. All the species of Brexia are natives of Madagascar. The other genera of this order are Ixerba, A rgophyllum, and Rousse°. There are but six species in all.
Encyclopedia of Plants; Lindley, readable Kingdom ; Don, Gardener's Dictionary.)