-243- 
(541) ROARK, R. C. 
1939* Agricultural products as insecticides* Indus* and Engin. 
Chen. 31: 168-171. 
(342) 
1940. The work of the Division of Insecticide Investigations, 
1927-1939* U* S* Bur. Ent. and Plant Quar. E-516, 
90 pp. [Processed.] 
(343) 
1941. Present status of rotenone and rotenoids. Jour. Eoon. 
Ent. 34: 684-692. 
(344) 
1941. A review of information on anabasine. U* S* Bur. Ent. 
and Plant Quar* E-537, 55 pp. [ Processed.]] 
(345) 
1942* The examination of plants for insectiddal constituents • 
Jour* Econ. Ent* 55: 273-275* 
(346) and BUSBEY, R. L. 
1956* A third index of patented mothproofing materials. U. S. 
Bur. Ent* and Plant Quar., 104 pp. [Prooessed.] 
(347) and KEENAN, G. L. 
1931. Plants reputed to have insecticidal value. Plants 
found in India. U. S. Bur. Chem. and Soils and Food 
and Drug Admin., 22 pp. [Prooessed.] 
(348) ROSENFELD, A. H. 
1925. Why not trap-crops that entrap? Jour. Econ. Ent. 18: 
639-640. 
(349) ROSKILL, 0. W., and CO. 
1939* World eoonomio review of insecticides and allied pro- 
ducts. C London] Progr. Rpts* on Bngin. and Chem* 
Processes, etc. 149 pp. [Processed.] 
(350) RUSBY, H. H. 
1889* Adhatoda vasica * Chem* and Drug. 34: 831* 
(361) SA¥DER, L. 
1906* Die Tsetsen (Glossinae Wiedemann)* Arohiv f* Sohiffs. 
u. Tropen Hyg* 9: 365-371. 
(562) SAYRE, L. S. 
1913* Inseotioides* Kan a. Acad. Sci. Trans. 25: 138-141* 
