LITERATURE CITED 
(1) Ampola, R., and Tommasi, G. 
1912. Composti di arsenico impiegati e pericoli che possono provenire 
dal loro uso. In Ann. R. Staz. Chim. Agr. Sper. Rome, s. 2, 
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(2) Association of Official Agricultural Chemists. 
1921. Official and tentative methods of analysis. As compiled by the 
committee on revision of methods. Revised to Nov. 1, 1919. 
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(3) Ball, E. D. 
1909. Is arsenical spraying killing our fruit trees? In Jour. Econ. 
Ent, v. 2. p. 142-148. 
(4) Titus, E. G., and Greaves, J. E. 
1910. The season's work on arsenical poisoning of fruit trees. In 
Jour. Econ. Ent., v. 3, p. 187-197, illus. 
(5) Babnttm, C. C. 
1923. The control of wild morning-glory. Calif. Agr. Exp. Sta. Cir. 
256, 22 p., illus. 
(6) Bevan, L. E. W. 
1908. Poisoning of stock with arsenic. In Vet. Jour., v. 64, p. 557-559. 
(7) Blyth, A. W. 
1895. Poisons. Ed. 3, 724 p. London. 
(8) Bose, J. C. 
1923. The physiology of the ascent of sap. 277 p., illus. London, 
New York, etc. 
(9) Brenchley, W. E. 
1914. Inorganic plant poisons and stimulants. 110 p., illus. Cam- 
bridge [Eng.]. 
(10) Burrows, C. W. 
1918. Poisoning green timber with sodium arsenite. In Agr. Gaz. 
N. S. Wales, v. 29, p. 113-114. 
(11) Formad, R. J. 
1910. The effect of smelter fumes upon the livestock industry in the 
Northwest. In U. S. Dept. Agr., Bur. Anim. Indus. 25th 
Ann. Rpt. 1908, p. 237-268, illus. 
(12) Gosio, B. 
1906. Sulla possibilita di accumulare arsenico nei frutti di talune 
piante. Nota preliminare. In Atti. R. Accad. Lincei, Rend. 
CI. Sci. Fis. Mat. e Nat., ser. 5, v. 15, sem. 1, p. 730-731. 
(13) Gray, G. P. 
1917. Spraying for the control of wild morning-glory within the fog 
belt. Calif. Agr. Exp. Sta. Circ. 168, 7 p. 
(14) 1919. Tests of chemical means for the control of weeds. In Univ. 
Calif. Pub. Agr. Sci., v. 4, p. 67-97, illus. 
(15) Greaves, J. E. 
1913. The influence of arsenic upon the biological transformation of 
nitrogen in soils. In Biochem. Bui., v. 3, p. 2-16. 
(16) 1913. The occurrence of arsenic in soils. In Biochem. Bui., v. 2, 
. p. 519-523. 
(17) 1913. Some factors influencing ammonification and nitrification in 
soils. In Centbl. Bakt, Abt. 2, Bd. 39, p. 542-560. 
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