154 III. COMPOUND COMBUSTIBLES.— 



of 6 or 700 deg. Falir. so that it may melt, exhale a peculiar scent, 

 and become brown : used by the cahco-printers. 



Mysachie. a gum, or gum resin, brought from Arabia, and 

 used in India. 



GUM-RESINS. 



Natural exudations from plants, miscible with water, but 

 neither saccharine nor gummy. Unless otherwise ordered, gum 

 resins are purified by being softened by heat, or by a small 

 quantity of water, ancl by pressing the softened mass through a 

 canvas cloth. 



Gum aloucht. From Wintera canella ? very odoriferous, 

 soft, dark-coloured. 



Gum ammoniac, Gummi ammoniacum^ Ammoniacnyn* Ob- 

 tained by incision of a plant like fennel, or from Heracleum 

 gummiferum : internally stimulant, expectorant, gr. x to 3ss dif- 

 fused in water ^ij. Officinal preparatiom. — Mistura ammoniaci, 

 L.D. Pil. scill. comp., Z/. jE. Emplast. ammoniaci, X. Em- 

 plastr. Ammon. cum Hydrargyro, L, 



Artichoke gum, Kunkirziid, From Cynara scolymus ; 

 emetic. 



AssA FffiTiDA, DeviVs dung, Hing, AssafcetidcB gummi-resina^ 

 FerulcB assafoetidce gummi-resina. Exudes from the fresh cut 

 surfaces of the root of Ferula assafcetida, from which it is scraped 

 off when dry, and a fresh surface made by paring the remaining 

 root till it is exhausted : purified as gum ammoniac ; expectorant, 

 stimulant, and antispasmodic, gr. x. to 3ss in water Sij ; used also 

 in clysters. Imported in cases and casks of various weights. 

 The principal officinal preparations. — Mist, assafoetidae, L. Z). 

 Tinct. assafoetid., L,, E. D, Spirit, ammon. foetid., L, E. D. 

 Pil. galb. comp., L. 



Gum bdellium, Bdellium, Bd, ex Oriente, Dale's Pharm. 



Myiirha imperfecta. Exudes from a nondescript Amyris, 

 called by Adanson niottout ; has most of the properties of myrrh, 

 used indiscriminately with it. Brought mixed amongst gum 

 Arabic and myrrh from India and Turkey. 



Bdellium ex Guinea, Dale, Gummi imhrum astringens. Kino 

 P. D. Yielded by the Butea frondosa ? ruby coloured, brittle, 

 contains a very small proportion of resin. 



Arabian bdellium. From Borassus flabelliformis. 



Italian bdellium. From Chamaerops humilis. 



Opocalpasum. a kind of bdellium yielded by some unknown 

 Amyris ; tough like wax, dark brown, bitter. 



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