STUDY OF YUCCA ANGUSTIFOLIA 165 



the total nitrogen in the powdered wood. It amounted to 4.75 

 per cent. The total albuminoids in the leaves gave 9.62 per 

 cent. 



DILUTE HYDROCHLORIC ACID EXTRACTS 



Extract (i), the Bark of the Root 



The powder insoluble in dilute soda was washed with water 

 and suspended in water containing i per cent, of hydro- 

 chloric acid. The absence of the blue color which the starch 

 granules assume when treated with iodine solution was de- 

 termined by examining the bark under the microscope; and 

 consequently it was not looked for in the extract. A quali- 

 tative test showed the presence of calcium phosphate and 

 calcium oxalate. A measured quantity of the filtrate was neu- 

 tralized with ammonia and mixed with three volumes of 90 

 per cent, alcohol. The precipitate was collected on a weighed 

 filter, washed with 60 per cent, alcohol, dried, and weighed. 

 It was incinerated, and the ash deducted from the precipitate. 



The precipitate yielded 5.20 per cent. 



" ofash ' 0.98 " 



Organic substance 4.22 " 



The filtrate from the 90 per cent, alcohol precipitate was 

 evaporated. The residue was composed of ammonium chloride 

 from the reagents employed, and an organic substance having 

 an odor like gum benzoin. It was agitated with ether, and 

 on evaporating the solvent a white residue with an odor like 

 benzoin was obtained. Sulphuric acid gave a red color with it. 

 The amount of this substance was calculated. It gave 0.45 per 

 cent. 



Extract (2), the Wood of the Root. 



The insoluble powder from the dilute soda maceration was 

 washed with distilled water, and suspended in water contain- 

 ing i per cent, of hydrochloric acid. The same means were 

 used as in extract (i) to determine the absence of starch in 

 the wood of the root. Parabin was also absent. Calcium oxa- 



