152 III. COMPOUND COMBUSTIBLES. - 



the same manner from French prunes, but they require boiling in 

 a small quantity of water to soften them ; use the same. 



Rob of elder berries, Roh haccarum sambuci sine saccharo. 

 Succus haccce sambuci inspissatus. Juice of the berries evaporated 

 by a gentle heat ; sudorific, diuretic. 



Rob of black currants, icithout sugar. Roh de rihes. As 

 the preceding ; diluted with water, it is used in cleansin^y gargles. 

 — The pulps or juices of other sweet fruits may be prepared in a 

 similar manner. 



GUMS. 



The word gum is also used as an adjective to signify any 

 exudation from plants, whether gummy, gummy resinous, or 

 even resinous, which is in a lump, as gum opium, powdered 

 opium, ammoniac in tears, gum ammoniac, and the hke. 



White gum Arabic, Gomme Turique^ Gummi Arabicum^ G. 

 Turicum^ Acacice gummi, MimoscB Niloticce gummi. In small 

 lumps, principally white : Turkey. The officinal preparations are 

 very numerous. — The principal are Mucilago acaciae, L. E. D. 

 Emulsio Arabica, D. Mist, cretoe, L.D. Confect. amygd. L. D. 

 Pulv. cret. comp., L.D. Pulv. tragac. comp., L. D. 



Yellow gum Arabic, Brown gum Arabic, Gum babul, Gum 

 harbara, Gomme de Jedda, Karoovelum pisin. In small lumps, 

 from Mimosa Arabica, yellower or darker than that of M. Nilo- 

 tica, not so soluble in water, and covers its surface with a pellicle, 

 which in making pastes and syrups is apt to fall to the bottom and 

 burn too. 



Gum Senegal, Gomme Arabique, Gummi Senegalense, G. 

 Seneca, G. Senegce. In large lumps, round, brown, from Mimosa 

 Senegalensis. These gums are nutritive, and used as food by 

 some negro nations; demulcent, 3j to 3ij, ad libitum ; also used 

 as a cement : to reduce them to a fine powder they must be pre- 

 viously dried, or the operation performed in a heated mortar, 

 with a hot pestle. 



Marrons, G. Turicum. Gum Senegal concreted together in 

 large masses by moisture. 



Bead-tree gum. St. Helena gum. Very dark, nearly black, 

 from the Melia azedarachta ; used by the dyers. 



Cashew gum, Brazil gum, Gomme d' acajou. Reddish yellow, 

 astringent ; its mucilage scarcely adhesive. 



Larch gum, G. Orenburgense. P. Ross, exuded from the 

 larch, is reddish, nearly transparent, not so glutinous as gum 

 Arabic, tasting rather resinous. 



Cherry-tree gum, G. cerasi ; — Peach gum, G. amygdalcB 



