36 TECHNICAL BULLETIN 134, U. S. DEPT. OF AGRICULTURE 
(20) Lereboullet, P. 
1910. La lutte contre les rats des tranch6es. Paris Medical G 
Annee: 165. 
(21) Lewin, L. 
1903. Trait6 de toxicologie. Translated and annotated by G. 
Poiichet. 1120p., illus. Paris. 
(22) Orfila, M. P. 
1818. Traite des poisons tir^s des regnes mineral, vegetal et 
animal on toxicologie generale, consideree sous les 
rapports de la physiologie, de la pathologie et de la 
medecine legale. Ed. 2, rev., corrected, and enl. 2 v. Paris. 
(23) ScHLUPP, W. F. 
1921. The destruction of rodents by the use of poisons. Union 
So. Africa Dept. Agr. Bui. 4 (1921), 34 p. 
(24) Silver, J. 
1927. Rat control. U. S. Dept. Agr. Farmers' Bui. 1533, 21 p., illus. 
(25) 
1929. Rat control AIDED BY development of effective new poisons. 
U. S. Dept. Agr. Yearbook, 1928: 518-521, illus. 
(26) Smith, W. F. 
1921. Liquid extract of red squill (scilla maritima) as a rat 
poison. Analyst 46: 17&-180. 
(27) Stoll, a., and Suter, E. 
1925. Heart-affecting pure glucoside from bulbus scillae and 
PRODUCING THE SAME. (U. S. Patent No. 1516562). Commr. 
Patents Ann. Rpt. 1924: 582. 
(28) WiNTON, F. R. 
1927. The rat-poisoning substance in red squills. Journ. Pharma- 
col, and Expt. Ther. 31: 123-136, iUus. 
(29) 
1927. A CONTRAST BETWEEN THE ACTIONS OF RED AND WHITE SQUILLS. 
Journ. Pharmacol, and Expt. Ther. 31: 137-144. 
U. S. GOVERNMENT PRINTING OFFICE: 1929 
