1246 ELEMENTS OF MATERIA MEDICA.

Pharmacopoeia. It is an agreeable

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„ a 1 . -g»n.auJe stomachic, and is principally .

as^a flavouring adjunct to decoctions and infusions Atonic or purgat^)

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effervescing mixtures, &c. Dose, fsj. to f'siij. AoiD^

5. Aqua Florum Aurantii, L. Aqua Aurantii, E. jj.

Water. (Orange-flowers, lb. x.; Proof Spirit, f5vij.; Water, ^atLet a gallon distil, L .)—Orange-flower water is usually imported. an t

prepared from the flowers of the bitter orange possesses the most j^ge.odour, but it is sometimes prepared from the flowers of the sweet 0 .° aIt contains free acetic acid, derived from the flowers; hence, if ae P rjj ievessel of lead or copper, it acquires a metallic impregnation-presence of lead in it has recently been pointed out by Mr. Sqm re ,Ann. of Med. Jan. 1837, p. 15). The following are the characterspure orange-flower water:—

“ Nearly colourless: unaffected by sulphuretted hydrogen.”— Ph. Ed. ^

Sulphuretted hydrogen produces, with either lead or copper, a , aScoloured precipitate. Orange-flower water is employed in medicwell as in perfumery, on account of its agreeable odour. ^

Aqua Coloniensis; Eau de Cologne; Cologne Water . —A much admired P^^sTwo varieties are known in the shops—the French and the German: the 1(r it 3re

the highest price. Both profess to be made by Farina. The recipes for 79k

numerous. I subjoin one, which is said, by Trommsdorf (Journ .d. Charm■ - q;| ot

to be followed in the Cologne manufactories:—Oil of Neroli; Oil ot Citron Jj.jjbsfBergamot; Oil of Orange; Oil of Rosemary: of each twelve drops.Cardamoms, jj.; Rectified Spirit, Oj. Distil.—Eau de Cologne forms an s {j,gl e

evaporating lotion in headache, fever, &c. It should be applied by means olayer of linen.

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The Fero'nia Elephan'tum, a large tree growing in most parts of India , f Itgum which is used for medicinal purposes by the practitioners of Lower In j l6lran exudation of the stem, and closely resembles gum Arabic (Ainslie, Mat. ij* c0 un ll JIt is not improbable, therefore, that part of the East India gum brought to(see p. 1149) may be the produce of this tree.

Order 68. Ternstromia'ce.e, Lindley. —The Tea Tribe-

Though unable to doFig. 232.

Thea Bokea.

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more than bestow a passing notice on Tea , I could no sU b'omit all reference to this important and interesti» ee fl-stance. Two kinds of Tea plant are cultivated in ” 0 (bef

houses; the one called Theaviridis or Green Tea , jniot*Thea Bohea or Black Tea . Great discrepancy 0 ^exists as to whether the different varieties of tea ^ e emerce are obtained from one or from two specRoyle’s Illustr. p. 109 ; and Hooker, Bot. Mag- ^ teajThe well-known differences between green and n c0 „teiidlend great support to the assertions of those ' v “° ro o’i 11 ^that these teas are obtained from different plants,in different provinces of China . Mr. Reeves’s obse^ t „ b eon this point (see Royle, op. cit.) appear to j.jnd 3exceedingly apposite. In commerce, two princip 1 ^ tb eof tea are distinguished,—the Black and Green- g a pef,first belong Bohea, Congou, Campoi, Souchong, jjy S o*<and Pekoe; to the latter, Twankay, Hyson-skin, ^ rf.Imperial, and Gunpowder . Frank (Gmelin, I* 3 itdChem. ii. 1252) analyzed both black and greenobtained the following results :—