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-) 



b. YELLOWISH IN GLYCERIN MOUNT. 



a Containing Oil Globules. 



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



P 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. 



