EXPERIMENTAL. 



with water, thoroughly extracted with alcohol of 0.90 sp. gr., then with 

 stronger alcohol, and finally with absolute alcohol and with ether. 



The precipitate was again dissolved in o. i per cent potassium-hydroxide 

 solution and allowed to stand over night. It was then filtered, and a part 

 of the clear filtrate first obtained was precipitated by neutralization with 0.2 

 per cent hydrochloric acid. This precipitate was washed with water, alco- 

 hol, absolute alcohol, and ether, yielding preparation 93. A part of this 

 preparation, 93, was redissolved in 0.2 per cent potassium-hydroxide water 

 and found to contain a considerable amount of substance which had become 

 insoluble in consequence of drying. This insoluble portion was filtered off, 

 washed with water, alcohol, and ether, and gave preparation 94. The filtrate 

 from this substance was precipitated with 0.2 per cent hydrochloric acid, 

 and the precipitate filtered off and washed with water, alcohol, and ether. 

 Through an accident this preparation dried on the filter and could not be 

 removed from the paper. It was then again dissolved in dilute potassium- 

 hydroxide water and treated exactly as before, yielding preparation 95. 

 The following analyses show the composition of these three preparations : 



Preparations 93, 94, and 95. 



