- 29 - 
The average yield of air-dry root fron plants of varying age was: 
.Age of Plants 
2 years 4 years 
L. chrysophoyllus no plants 7 ounces 
L. Liartynii 32.55 ounces 37.35 ounces 
D. clliptica Changi Ho. 3 
The rotenonc content of the fine roots of L. chrysophyllus was 3 per 
cent for the 2-ycar old plants and 4.3 per cent for 4-year old plants. The 
total ether extracts on these sanplcs v/crc 7.9 and 8.8 per cent respectively. 
■k' Maxtynii ", 4 years old, contained only 0.8 percent rotenonc in the fine 
roots "but 1.1 percent in the coarse roots. Derris clliptica Changi Ho, 3 
contained an average of 9 per cent rotenonc and 27 per cent ether extract. 
All these figures are on a noisturc- free "basis. 
G-oodcn and Snith (168) in 1937 investigated the principal optical and 
physical properties of the carbon tetrachloride solvate of rotenonc, which is 
forncd in the analysis of derris and cube. The principal results of the op- 
tical determinations arc: alpha =1. 563; bata = l. 612; gamraa<L.631; optical character, 
negative; elongation, commonly negative; system, orthorhonbic. The density at 
30° is 1.40 g. per cc. The dissociation pressure in the range 60° to 90° is 
expressed "by the equation log P m. = 9.308 - (2313/ TK). The "decomposition 
temperature" is consequently 87° , and the heat of dissociation-vaporization 69 
calorics per gran of carbon tetrachloride. 
According to Krukoff and Smith (255) the rotenonc- content of certain • 
South American plants is as follows : 
Average content (on an air-dry 
"basis of 12 percent noisturc) of — 
Rotenonc Extractives 
(percent) (Percent) 
Loncho carpus chrysophyllus Kleinh. 2.1 9,4 
L. floribundus Benth. poor 
L. Martynii A.'C. Snith 2.3 10.1 
L. rari floras Mart. trace 7 
L, sylvestris A. C. Snith none 
L. urucu Killip and Smith 4.4 17 
L. utilic A. C. Snith 12 . 25 
L. sp. (Tinbo branco) 7 16 
Derris auazonic a Killip 0.3 2 
