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Articles or "books on .insecticides, popular writings on insect 
control, and reviews of the' literature on ro tenon e and derris which 
include information on cube have been published as follows: 
1929 
1930 
1934 
1934 
1934 
1935 
1935 
1935 
1935 
1935 
1935 
1935 
1936 
1936 
1936 
1936 
1936 
1936 
1936 
1937 
1937 
1937 
Wardle, 457 
Anonymous, 2 
Peet, 317 
Roark, 345 
Roark, 344. 
Hamilton, 183 
Hooper, 197 
Neu, 301 
Maas, 265 
Roark, 346 
Whittaker, 465 
Whittaker & Whittaker, 466 
Peters, 326 
Martin, 263 
Poole, 331 
Nat. Canners Assoc, 295 
Nat. Canners Assoc, 296 
Raucourt, 339 
Vinas , 450 
Cates, 67 
Consumers Res. , 89 
Nat. Canners Assoc, 297 
The United States Department of Agriculture, Bureau of Entomology 
and Plant Quarantine, by means of press releases, annual reports and 
the Monthly News Letter, has from time to time called attention to its 
work on cube. Roark' s (348) publication on Lonchocarpus is noted in 
the News Letter (349) for May 1936, and attention is called to Jones' 
(219) paper on the optical rotatory power of extracts of derris and 
cube roots in the News Letter (220) for March 1937. Roark' s (350) 
compilation of information on Tephrosia, which contains some references 
to Lonchocarpus, is noted in the News Letter (351) for May 1937. 
The United States Department of Agriculture (414) on January 
13, 1936, published the following under the heading "Search is on for 
organic chemicals deadly to insects but safe for man." 
Preparations containing rotenone — a natural 
principle of derris and cube, plants of the Far East 
and South America — are now used in many parts of the 
United States for some insect pests. Certain disadvantages, 
however, bar their use for some types of insects. For 
example, derris is not effective against all insects. It 
is not effective against the celery leaf tier. It repels, 
but has no other effect, on the semitropical army worm. 
It does kill the common cabbage worm, however. Like many 
organic compounds, rotenone and related compounds are 
rather easily destroyed by sunlight. Although toxic to 
