-102- 
155. CAMPBELL, F. L., and qULLIVAN, W. N. 
1935. Cracca — a source of insecticides. Soap 11 (9): 99, 101, 
103, 105, 107, 109. 
156. GERSDORFF, W. A., GOOLEF, E. L., -CA'.'IFBELL , F. L., and 
SULLIVAN, W. N. 
1933. Loss in toxicity of deposits of rotenone end related 
materials exposed to light. Jour. Econ. 2 n t. 26: 451— i70. 
157. and SMITH, C. M. 
1936. Derris and cube. Soap 12 (6): 113-117. 
158. JONES, M. P. 
1939. 4-H Club insect manual. U. S. Dept. Agr. , Misc. Pub. 313, 
63 pp. , illus. 
159. KELSALL, A., SPITTALL, J. P., GORHAM, R. P., and WALKER, G. P. 
1926. Derris as an insecticide. Ent. Soc. Cntario Ann. Rpt. 
56: 24-40. 
160. KILGORE, L. B. 
1939. Selective extraction of rotenone by certain esters, U. S. 
Patent 2,149,917; issued March 7, 1939; assigned to 
Kilgore Development Corporation. 
161. KOLONIAAL INSTITUUT TE AMSTERDAM 
1930. Toeba-wortel, Inlichtingen en onderzoekin-zen van de 
afdeeling hendelsmuseum in 1929. Amsterdam Eolon. 
Inst. Afd. Handelsmuseum Meded. 26 (8): 91-99, illus. 
162. 
1936. . Plantenziekten en-Plagen. Inlichtingen en onderzoekingen 
van de afdeeling handelsmuseum in 1935. Amsterdam Kolon. 
Inst. Afd. Handelsmuseum Meded. 39 (l6): 78-102, illus. 
163. KUIJPER, J. 
1929. Akar toeba ( Derris elliptica ) het bestrijdintrsmiddel van 
tabaksluis ( Myzus persicae) in Deli. Deli Froefsta. te 
Medan Meded. 58 (2) : 3-61, illus-. 
