750 BOTANY AND PHARMACOGNOSY. 



II. FEW OR NO FRAGMENTS OF VEGETABLE TISSUE. 



A. GIVING OFF ODOR OF SULPHUR 

 DIOXIDE ON HEATING. 



94. SULPHUR LOTUM. In small chain-like masses in 

 glycerin mounts. 



95. SULPHUR PR^CIPITATUM. Small rounded masses 

 in irregular groups in glycerin mounts. 



B. NO ODOR OF SULPHUR DIOXIDE WHEN HEATED. 



a. NEARLY COLORLESS IN GLYCERIN MOUNT. 



96. MASTICHE. Transparent, irregular masses. (See p. 

 645-) 



h. YELLOWISH IN GLYCERIN MOUNT. 



a Containing Oil Globules. 



97. SCAMMONIUM. Irregular masses. (See p. 656.) 



)8 Transparent or Translucent. 



98. COLOPHONY. Irregular masses, soluble in cold alco- 

 hol (95 per cent.) forming a straw-colored liquid, which becomes 

 milky-white on addition of water ; on heating fragments of resin 

 in water they melt, run together and form a sticky mass. 



99. SANDARAC. Almost insoluble in alcohol (95 per 

 cent.), the solution remaining almost colorless; the fragments 

 do not melt when heated with water. (See p. 81.) 



100. ALOE (CAPE). In glycerin mount some fragments 

 are conchoidal ; the particles become clear and dissolve, leaving a 

 few colorless lens-shaped or fine acicular crystals. The latter are 

 more abundant in Barbadoes aloes. (See p. 664.) 



y More Opaque. 



loi. AMMONIAC. Irregular, faint yellow, opaque masses, 

 made up of small, whitish or grayish particles. 



