STUDY OF YUCCA ANGUSTIFOLIA 139 



in absolute alcohol, amyl alcohol, benzole, chloroform, gly- 

 cerin, and a solution of alcoholic soda; soluble in potassium 

 iodide, potassium chromate, mercurous nitrate, cobalt nitrate, 

 potassium ferro- and ferri- cyanide solutions; insoluble in am- 

 monia and aqueous alkalies. 



Yuccal was treated with spirit of different strengths, as a 

 means of separating resin acids if any were present. It was 

 treated with 85 per cent, spirit; an opaque brown substance 

 was left undissolved, which was soluble in absolute alcohol; 

 insoluble in ether, and colored brown by concentrated sul- 

 phuric acid. The color was not discharged by alcohol or ether. 

 The 85 per cent, spirit solution was evaporated, and the residue 

 treated with 50 per cent, spirit, and a small quantity of a brown 

 residue was insoluble. The 50 per cent, spirit solution, on 

 evaporating, left a non-crystalline, transparent, reddish-colored 

 solid, acid to litmus. It was colored cherry-red by concen- 

 trated sulphuric acid, and slowly dissolved to a yellowish-red 

 liquid. 



Extract (3), the Green Part of the Leaf. 



The residual powder from the petroleum spirit maceration 

 was thoroughly dried, and again placed in the percolator. It 

 was treated with Squibb 's stronger ether. The extract was a 

 deep green-colored liquid and fluorescent. The reaction was 

 slightly acid. Alcohol, benzole, and petroleum spirit added 

 to the ethereal extract did not cause a precipitation. An amor- 

 phous and green-colored residue was obtained on evaporating 

 the extract. The amount of total solids was estimated from 

 a definite volume of the extract, which was evaporated, dried, 

 and weighed. 



TOTAL SOLIDS. 



Ethereal residue dried at 100 C 1.25 per cent, of solids. 



" 110 C 1.14 " " " 



o.n " loss. 



The ethereal residue was brought into a state of fine divi- 

 sion and treated with water. The amount of total solids 

 soluble in ether and water was 0.34 per cent. The aqueous 



