-178- 
86. CROSBY, C. R. , and CHUPP, C. 
1934. The control of diseases and insects affecting vegetable 
crops on Long Island. N. Y. Agr. Col. (Cornell) Ext. 
Bui. 278, 87 pp., illus. 
87. CHUPP, C, and LEIBY, R. "7. 
1939. The control of diseases and insects affecting vegetable crops 
on Long Island. II. Y. Agr. Col. (Cornell) Ext. Bui. 278, 
87 pp., illus. (Rev. Feb. 1939). 
88. CURRIE, J. H. 
1934. Rotenone, a powerful new insecticide. Pacific Rural Press 
128 (12): 215. 
89. DANIELS, C. W. 
1905. A plea for the scientific study of native drugs and poisons. 
Malaya Branch Brit. lied. Assoc. Jour. [Singapore.] (n.s.) 
2: 3-5. [Reviewed in Brit. lied. Jour. 2373: 1475.] 
90. DAVIDSON, 17. M. 
1930. Rotenone as a contact insecticide. Jour. Econ. Ent. 23: 
868-874. 
91. and JONES, H. A. 
1931. Change in toxicity of rotenone in solution and suspension. 
Jour. Econ. Ent. 24: 257-262. 
92. DELASSUS and LAFFOND- 
1936. L'utilisation des poudres a base de rotenone dans la lutte 
contre l'eudemis. Acad. d'Agr, de France Compt. Rend. 
22: 94-98. 
93. and LAFFOND 
1937. Les poudres insecticides a base de rotenone dans la lutte 
contre l'eudemis. Acad. d'Agr. de France Compt. Rend. 
23: 181-189. 
94. DELI PROEFSTATION TE MSDAIT 
1929. Akar toeba ( Derris elliptica ) het Bestri jdingsr.iddel van de 
tabaksluis ( Lfyzus persicae ) in Deli. Deli Proefsta. te 
lledan Meded. 58 (2): 3-61, illus. 
95. DeONG, E. R. 
1930. The comparative insecticidal value of different species of 
derris. Jour. Econ. Ent. 23: 619-624. 
96. and MITE, L. T. W. 
1924. Further studies of derris as an insecticide Jour. Econ. 
Ent. 17: 499-501. 
