. - 10 - 
evaporated, and then dried at 50° C. for 12 hours and weighed. Valiifis for 
acetone extracts were highest, those for ether and chloroform lower and 
about equal to each other, and those for carbon tetrachloride generally- 
lowest. 
Koolhaas and Mei.jer in 1937 reported on the analysis of a sajnple 
of derris root by several laboratories in various parts of the world. 
Some of the methods and results for. total extract were briefly as follows: 
Laboratory 
Total extract 
Method (moigture-fr2e basis) 
Percent : ' 
A — United States Department of 
Agricultiire (Jones) 
25 ^. benzene, 2 periods 
totaling 24 hours 
18.2 
E — Department of Agriculture, 
Straits Settlements and Fed- 
erated Malay States (Cxeorgi) 
5 gm. ether, 18 hoiirs 
19.3 
C — Commercial Museum of the 
Colonial Institute, Amsterdam 
(Hov/aan) 
5 gm. ether, 48 hours 
19.1 
D — The Cooper Technical Bureau, 
London (Cahn and Boam) 
10 gm. ether, 3 periods 
totaling 96 hours 
18.0 
3 — Jnothamsted Experimental Station 
(Tattersfield and Martin) 
5 gn. Analar ether, 3 periods 18.9 
totaling 30 hours 
5 gm. anhydrous ether, 2 
periods, totaling 16 hours 
F — Seil, Putt, and Husby, New York 5 gm. ether, until exhausted 
(Seil) 
17.7 
19.2 
G — Caeser and Lorentz, Ealle-Saale, 5 gm. ether 
C-ermany 
18.6 
H — Diethelm, Ltd., Singapore 
I — Laboratory for Chemical Re- 
search, Buitenjorg, Java 
(Koolhaas and Meijer) 
25 gm. ether 18.1 
50 gm. ether, 2 periods 19.6 
totaling 48 hours 
See footnote 1. 
