-2F 
(419) WASHBURN, P. L. 
1902. Insects notably injurious in 1902* Minn* Agr. Expt. 
Sta. Bui. 77, 74 pp. 
(42t) WATS, R. C, and BHARUCHA, K. H. 
1938. Larvicides for antimosquito work, with special referenoe 
to cashew-nut shell oil* Malaria Inst* India, Jour. 
1: 217-219* 
(421) and SINGH, J. 
1937* An investigation into the mosquitocidal value of indi- 
genous derris and other drugs* Reo* Malaria Survey 
India 7: 109-114* 
(422) WATT, G. 
1889-96. A dictionary of the economic products of India. 6 v* 
London end Calcutta* 
(423) WATT, J. M., and BREYER-BRANDWIJK, M. G* 
1932* The medicinal and poisonous plants of southern Africa* 
314 pp* Edinburg* 
(424) WEBSTER 
1940* Helleborus ori entails . In Webster's New Internet 1* 
Dictionary of the English Language* Ed* 2, unabridged, 
p* 1159* Springfield, Mass* 
(425) WILCOXON, F., HARTZELL, A., and WILCOXON, F. 
1939* Insecticidal properties of extract of male fern ( Aspidlum 
felix-mas CL*3 SW.)* Boyce Thompson Inst* Contrib* 
Hi 1-4* 
(426) WILLCOCKS, W. 
1927* Why is cultivated Egypt immune from malaria? 15 pp* 
Cairo* (Nile Mission Press*) 
(427) WILLIAMS, J. B. 
1914* The insecticidal value of fluid extract of larkspur seed* 
Amer* Jour* Pharm* 86s 414-416* 
(428) WILLIAMS, S. W* 
1849* On the indigenous medical botany of Massachusetts* Amer* 
Med* Assoc* Trans* 2: 863-927. 
(429) WILSON, S. D., CHAO, YUN-TS'UNG, and CHU, JEN-FEI. 
1937* The toxio prinoiple of "oh'a tiu," a fish poison from 
South China. Peking Nat* Hist. Bui. 11 (4) t 367-371. 
