190 VETERIXARY MATERIA MEDICA. 



pentine Siv., added to linseed oil O i.; to this add 

 slowly H2SO4 3 i. This mixture must be cautiously 

 prepared, as it evolves great heat. 



Derivatives of Turpextixe. — Besina, resin, 

 colophony. The residue left after distilling of the 

 volatile oil from turpentine; it is that portion of tur- 

 pentine which is fixed by oxidation. A transparent, 

 amber-colored substance, hard, brittle, with a glossy 

 and shallow conchoidal fracture, and having a faintly 

 terebinthinate odor and taste. Specific gravity 1.070 

 to 1.080. It is soluble in alcohol, ether, fixed and 

 volatile oils. Dose same as terebinthina. 



Ceratum Resince, unguentum basiliconis, resin 

 cerate, basilicon ointment. Composed of resin 35, 

 yellow wax 15, lard 50 parts. 



Terebeiieiim, terebene — Cj^Hje — is a hydrocarbon 

 obtained by the oxidation of oil of turpentine by 

 means of sulphuric acid. A colorless liquid, of a hot 

 taste, soluble in alcohol. Dose, one-half to three- 

 fourths of that of oil of turpentine. 



AxALOGUES OF TuRPEXTiXE. — Pix, pitch, is a 

 resinous exudation from the stems of certain trees of 

 the genera Pinus (pine) and Abies (fir and spruce) . 

 It may also be obtained by the evaporation of wood- 

 tar. Three varieties of pitch are in general use : 



1. Pix Burgundica^ Burgundy pitch, the prepared 

 resinous exudation of Abies excelsa, Norway spruce, 

 natural order Coniferse. Hard, brittle, opaque mass- 

 es, very fusible, readily soluble in glacial acetic 

 acid. 



2. Pix Canadensis, Canada or hemlock pitch, the 



