YUCCA ANGUSTIFOLIA. 257 



alcohol ; absolute alcohol hardened and discolored it. Concentrated sulphuric acid, 

 nitric acid, and hydrochloric acid, did not appreciably act on the residue. It was not 

 saponified, but slowly dissolved by boiling aqueous and alcoholic soda. The alco- 

 holic solution of the petroleum spirit residue Avas submitted to a fractional precipi- 

 tation with an alcoholic solution of magnesium acetate. The first precipitation 

 obtained was purified by boiling alcohol ; it was an opaque scaly crystalline solid 

 which melted at 85° C. The second precipitation yielded traces of a white amorphous 

 substance. The third precipitation resulted fi-om adding strong ammonia water to the 

 magnesium acetate solution, and the purified residue melted at G0° C. 



Negative tests for alkaloids followed an examination of the aqueous treatment of 

 the petroleum spirit residue. 



Extract (3), Qreen Fart of the Leaf. 



The method of extraction was the same as that used in the previous extractions. 

 The extract was clear, pale green in coloi-, and non-fluorescent. It was colored by a 

 small quantity of chlorophyll, which the petroleum spirit dissolved. The liquid was 

 acid in reaction. A drop of it left a permanent stain on lilue paj)er when evapoi-ating. 

 The extract was evapoi-ated at the ordinary temperature, and the residue was a dark 

 greenish-yellow semi-fluid substance. The solidifying point was taken. It was found 

 to be about 15° C. A definite volume of the petroletim spirit extract was evaporated, 

 dried, and weighed. 



TOTAL SOLIDS. 



Petroleum ipiril residue dried at lOQO C 2.20 per cent of solids. 



IIOOC 2.01 



0.19 " " loss. 



The pet roleu)7i sjurit residue was identified as a fixed oil with a small amount of 

 chlorophyll that had been brought into solution by it. It was soluble in cold 83 per 

 cent, alcohol, 95 per cent, alcohol, absolute alcohol, ainyl alcohol, ether, acetic ether, 

 chloroform, ben/ole, carbon di-sulphide and glycerin. It was also soluble in oil of 

 turpentine, almond oil, ammonium hydrate, mercuric chloride, and slowly soluble in 

 acetic acid. Concentrated nitric acid, and hydrochloric acid slowly dissolved the 

 fixed oil, the former colored it dark green, and on stirring the mixture the color was 

 changed to a brown. Concentrated sulphuric acid dissolved and changed it to a very 

 dark-brown color ; on adding concentrated nitric acid, the li(|uid was changed to a 

 leddish-brown color. 



The following reactions were noted: Tlie lixcd oil cliangi'd to a hard greeiii.sh- 

 yellow substance on heating it with anhydrous boia.x on platinum foil. When rubbed 



