142 
PLANT AND ORGANIC CHEMISTRY 
The ethereal residue (the residue insoluble in water) was an 
opaque, reddish-yellow colored substance, and was identified 
as a resin. It melted at 79° C. It was insoluble in ether, ben¬ 
zole, chloroform, and acetic ether; incompletely soluble in cold 
absolute alcohol, amyl alcohol, carbon di-sulphide, and oil of 
turpentine. It was soluble in aqueous and alcoholic soda. On 
boiling with them, it was saponified. Concentrated sulphuric 
acid dissolved the resin and colored it a yellowish brown. 
Chloroform formed a turbid mixture with the acid solution. 
The action of strong nitric acid on the resin was slow. The 
resin was incompletely soluble in 95 per cent, alcohol. Lead 
acetate gave a cloudliness with the alcoholic solution which 
increased on boiling. Ferric chloride thickened the alcoholic 
solution, and on boiling it gave a yellow precipitate which 
was insoluble in acids, alkalies, absolute alcohol, and acetic 
ether. The chloroform extract gave no coloration with bro¬ 
mine solution. 
SUMMARY II. ETHEREAL EXTRACTS 
Solids 
extracted. 
Character 
of residue. 
Reaction 
with lit¬ 
mus. 
Melting- 
point. 
Specific 
gravity. 
Substances 
soluble in 
ether and 
water. 
Substances 
soluble in 
alcohol and 
water. 
Substances 
soluble only 
in ether. 
1. Bark of the 
root.... 
resin 
acid 
70 0 C. 
I.O9I 
traces 
traces 
2. Wood of 
the root 
1.70% 
resin 
slightly acid 
70 0 C. 
1.091 
traces 
traces 
3. Green leaf 
1.25% 
f resin ) 
< chloro- J 
slightly acid 
8o° C. 
o* 34 % 
0.15% 
0.65% 
4. Yellow 
base of leaf 
1.70% 
(phyll ) 
resin 
slightly acid 
79 ° C. 
0.80% 
0.40% 
0.50% 
The residues from the ether extracts (1) and (2) of the bark 
and of the wood of the root contained resins which were 
identified as the same compound. They correspond in color, 
melting-point, specific gravity, solubilities, and reactions. The 
resin is a transparent, ruby-colored substance, crystalline in 
structure, and of a softer consistency than ordinary resin. 
It was examined by Hirschsohn’s scheme. 1 It differed from 
all described resins in its reactions with the reagents used to 
identify them. It is proposed to name it yuccal. 2 
1 Loc. cit. 2 See foot-note, ether extract (2). 
