STUDY OF YUCCA ANGUSTIFOLIA 163 



Several estimations were made on two specimens of the 

 Yucca, collected at different times of the year. 



Mean percentage, A 8.95 per cent. 



" " B iQ.40 1 " 



SUMMARY IV. AQUEOUS EXTRACTS 



The aqueous extracts contained gum, albuminous substances, 

 carbhydrates, glucose, saponin, organic acids, calcium ox- 

 alate, and no tannin, mineral acids, nor alkaloids. Arabin 

 was not separated from gum (i). Calcium oxalate was brought 

 into aqueous solution possibly by means of the organic acids 

 or saponin. Needle-shaped crystals were found in extract (3). 

 They did not respond to tests for formates, acetates, ma- 

 lates, citrates, tartrates, phosphates, oxalates, glucosides, and 

 alkaloids. 



Aqueous extracts of 50 C. to 60 C. from the bark and wood 

 of the root contained Inulin. 



DILUTE CAUSTIC SODA EXTRACTS 



Extract (i), the Bark of the Root. 



The residual powder insoluble in water was suspended 

 whilst moist in a dilute soda solution (o.i to 0.2 per cent). 

 After twenty-four hours the mixture was filtered. One volume 

 of the filtrate was acidified with acetic acid and mixed with 

 three volumes of 90 per cent, alcohol, and allowed to stand 

 in the cool. The precipitate was collected, washed with 75 per 



" Examination of the Yucca angustijolia," by H. C. De S. Abbott, The 

 Medical and Surgical Reporter, September 12, 1885, p. 301. 



