STUDY OF YUCCA ANGUSTIFOLIA 157 



dish-violet-color reaction. Another portion of the carbhydrate 

 filtrate residue was precipitated with neutral acetate of lead 

 and filtered. The precipitate was suspended in water, de- 

 composed by sulphuretted hydrogen, and the lead sulphide 

 filtrate evaporated over a water-bath to expel all odor of sul- 

 phuretted hydrogen. The liquid was cooled and lime-water 

 added until the reaction was alkaline to litmus. A turbidity 

 formed when the lime-water was added to the filtrate, and 

 was not entirely cleared on the addition of dilute acetic acid. 

 A neutralized portion of the lead sulphide filtrate gave a 

 yellow precipitate with a ferrous salt. Oxalic acid by these 

 tests was indicated, and possibly other vegetable acids were 

 present in the filtrate. The carbhydrate filtrate residue was 

 examined for tannin, and with a negative result. Calcium 

 oxalate was separated. 



Extract (2), the Wood of the Root. 



The powder used in the alcoholic maceration was thoroughly 

 dried, and replaced in the percolator. A measured quantity 

 of cold distilled water was allowed to percolate slowly through 

 the powder. The extract was colored, and slightly acid in re- 

 action. A definite volume of the extract was evaporated, dried, 

 and weighed. A known weight of the residue was incinerated 

 in a weighed covered porcelain crucible, and the ash deter- 

 mined. The ash was white and incompletely soluble in water. 



TOTAL SOLIDS. 



Aqueous residue dried between 100 C. and 110 C 12.10 per cent. 



" ash 1.74 " 



Gum. 



A certain quantity of the aqueous extract was mixed with 

 two volumes of stronger alcohol (Squibb's). The mixture was 

 allowed to stand for twenty-four hours, and the precipitate 

 which formed was collected on a weighed filter. It was dried, 

 and weighed. The precipitate and filter were incinerated in 



