POWDERED DRUGS AND FOODS. 781 



200. MYRRHA. — In glycerin mount the powder appears in 

 yellowish or yellowish-brown irregular fragments made up of a 

 grayish matrix containing yellowish or yellowish-brown oil 

 globules (p. 674). 



b. WITHOUT OIL. 



a Remaining Opaque {Not A'ffected) in Glycerin. 



201. ALOES (SOCOTRINE),— SHghtly afifected. (See No. 

 206.) 



202. BENZOINUM. — Irregular, colorless and wine-colored 

 fragments; some rosette-shaped groups and collections of small 

 tetragonal crystals. Upon covering a fragment on a slide with a 

 watch crystal and cautiously heating, crystals of benzoic acid 

 are sublimed on the watch crystal (p. 672). 



203. ELATERINUM. — Grayish and grayish-brown, more or 

 less opaque, irregular fragments; upon heating a fragment with 

 phenol, and when cool, adding sulphuric acid, a deep-red colora- 

 tion is produced. Potassium hydrate has no action on elaterin 



(P- 387). 



204. LACTUCARIUM. — Grayish-brown and dark brown, 

 irregular and rather angular masses ; with alkalies they become 

 reddish-brown and then a dirty brown ; with sulphuric acid they 

 are but sHghtly affected (p. 649). 



;8 Becoming More or Less Translucent in Glycerin. 



205. ALOES (CURASAO). — In a glycerin mount the parti- 

 cles become clear and behave like Cape aloes, but generally numer- 

 ous acicular, or large prismatic crystals remain, or separate in the 

 clear yellow space where the fragment of aloes was originally. 

 The fragments are colored red with solutions of the alkalies 

 (p. 663). 



206. ALOES (SOCOTRINE).— In a glycerin mount the 

 fragments are not very perceptibly affected. At the most there 

 is but a faint yellowish color around the grayish or grayish-brown 

 masses. In old Socotrine aloes the gray masses look like rosette 

 crystals. The fragments are colored red with alkalies (p. 663). 



