- 18 - 
Percentage of rotenonc 
Air-dry basis Oven-dry bases 
Sample A 1.6 1*7 
Sample B 1.0 1.0 
Barrett (17) in 1S35, in describing the vegetative propagation of 
derris, expresser 1 tho opinion that prolonged intensive cultivation of Dcr- 
ris and poncho carpus night result in an increase up to 15 percent of the 
"alkaloids" [rotenonc?] in the roots. 
Colombia . — Neathery (293), Assistant Trade Commissioner at Bogota, 
Colombia, reported on January 19, 1937, on the active interest in exploita- 
tion of barbasco in Colorfoia. Several varieties of barbasco known to exist 
in various regions cf Colombia and which have heretofore been used almost 
exclusively as a fish poison by native fishcrnen, arc being studied by of- 
ficials of the Ministry of Agriculture and Connerce in Bogota in an effort 
to detcmine the rotenonc contents of some of the most abundant plants. It 
is understood, also, that an expedition into the Aoaaon region will be nadc 
in the near future to ascertain the potential supply and chemical content of 
plants which are reported to abound in that soction of the republic. Scnor 
Luis Uribc Agiiirre, reportc". to bo associated with Lawrence C. Seville of 
Hew York, will lead the investigation. Tho Ministry cf Agriculture .and Con- 
nerce has received samples of barbasco fron Tunaco, Lcticia, and other munic- 
ipalities of the Anazon territory, tne Department of Boyaca, and tho Meta 
region. An analysis of the Tunaco specimen, according to statements made 
recently, reveals a minimum and maximum rotenone content of 2.93 and 5.27 
percent, respectively. While barbasco exports have been insignificant in the 
past, an increase in the volume nay "oo expected if present investigations 
result in the discovery of a high rotenonc content of existing stands. 
Malaya . — Tho Federated Malay States Department of Agriculture (140) in 
1933 introduced black and white haiari fron British Guiana at Serdang, F. M. S, 
Cantloy (64), in a list of the principal economic plants contained in the 
forest experimental nurseries, Stro.its Settlements, in 1886, included Lon- 
cho carpus sp. (Yurabo indigo) fron the West Indies. 
In its annual report for 1935 (141) the Federated Malay States Do- 
partment of Agriculture stated that plants of haiari root were propagated 
by layering. Analyses of these haiari s fron Serdang, aged about 25 months, 
were as follows: 
Percent on a noisturc-f roc basis 
Ether extract Hotenone 
Black haiari 7.9 3.0 
White haiari 7.7 0.8 
G-oorgi (160) has also referred to the low rotenonc and ether extract 
content of these haiaris (Town at Serdang. Analyses will be made again when 
the plants are 4 years old. 
