

STUDY OF YUCCA ANGUSTIFOLIA 127 



ally followed. Ten grams of the air-dried powder were used 

 for the preliminary examination of soluble substances. For 

 every gram of the powder, ten c. c. of the solvents were em- 

 ployed. An additional quantity of the powder was prepared 

 for special purposes. Five grams of the air-dried powder were 

 dried, in a hot-air oven, at a temperature between 100 C. 

 and 110 C., until the weight remained constant, for the esti- 

 mation of moisture. This powder was incinerated in a cov- 

 ered porcelain crucible at a dull red heat until the carbon was 

 entirely consumed. The per cent, of total ash was determined 

 from it. 



QUALITATIVE ASH ANALYSES 



Calcium, magnesium, potassium, sodium, iron, manganese, 

 chlorides, phosphates, and sulphates were found in every part 

 of the plant. 



f i. MOISTURE ) 



< > on the powder. 



| II. TOTAL ASH j 



Determination of 



PETROLEUM SPIRIT EXTRACTS 



Extract (i) Bark of Root. 



The maceration was conducted in an apparatus similar to 

 one described in DragendorfFs "Plant Analysis." 1 A light 

 petroleum spirit was used which boiled between 25 C. and 

 45 C. The extract was filtered from the powder-residue. It 

 was a clear pale yellow-colored liquid, and slightly acid in 

 reaction. A drop of the extract on evaporating left a uniform 



1 Page 99, Tollen's apparatus. 



