1922] 



YOUNG — THE TOXIC PROPERTY OF SULPHUR 433 



11. Finely divided sulphur is more readily oxidized to penta- 

 thionic acid at ordinary temperatures than is the flowers of 

 sulphur. 



12. Finely divided sulphur has been used as a spray in Eng- 

 land, Australia, and Germany, with excellent results. 



The writer takes pleasure in extending thanks to Dr. B. M. 

 Duggar, who has directed the work, for many timely suggestions 

 and criticisms; to Dr. George T. Moore, for the privileges and 

 facilities of the Missouri Botanical Garden; and to the Crop 

 Protection Institute for funds and materials. 



Bibliography 



Armstrong, G. M. ('21). Studies in the physiology of the fungi. XIV. Sulphur 

 nutrition: the use of thiosulphate as influenced by hydrogen-ion concentra- 

 tion. Ann. Mo. Bot. Gard. 8:237-281. /. 1-14. 1921. 



in, C. T., and Wiltshire, S. P. ('20). Sulphur as a 

 ol Agr. and Hort. Res. Sta., Ann. Rept. 1919:57-75. 



Wallace, T. ('22). A new method of sulphur fumigation. Ibid. 



fungicide. 

 1920. 



1921: 122-124. 1922. 



Bary, Paul ('20). Le soufre colloidal. Compt. Rend. Acad. Paris 171:433-435. 



1920. 



Berthollet, C. L. (1798). Observations sur l'hydrogene sulfure. Ann. de Chim. 



25: 233-272. 1798. 

 Berzelius, J. J. (1808). Angaben fiber kolloiden Schwefel. Larobok; Kemien 



l:sta. uppl. Del. I. Stockholm, 1908. [Cited by Oden, '13.] 

 Bioletti, F. T. ('07). Oidium or powdery mildew of the vine. Cal. Agr. Exp. 



Sta., Bui. 186:313-350. 1907. 



Blodgett, F. M. ('13). Hop mildew. Cornell Univ. Agr. Exp. Sta., Bui. 328: 



280-310. 1913. 

 Bourcart, E. ('13), Insecticides, fungicides and weedkillers. 431 pp. (See 



pp. 44-46; 48-52; 78-88.) London, 1913. [Translated by D. Grant.] 

 Butler, O. ( '17). How to control the snapdragon rust. Flor. Exch. 43:353. 1917. 

 Clark, W. M, ('20). The determination of hydrogen-ions. 317 pp. /. 1-38. 



Baltimore, 1920. 



Debus, H. ('88). Ueber die Zusammensetzung der Wackenroder'schen Fliis- 



sigkeit und die Bildungsweise der darin vorkommenden Korper. Lieb. Ann. 

 d. Chem. 244:76-189. 1888. 

 Doran, W. L. ('17). Controlling snapdragon rust. Value of copper and sulphur. 

 Flor. Exch. 43: 501. 1917. 



-, ('22). Laboratory studies of the toxicity of some sulphur fun- 



gicides. N. H. Agr. Exp. Sta., Tech. Bui. 19:1-11. 1922. 

 Duggar, B. M., Severy, J. W., and Schmitz, H. ('17). Studies in the physiology 



of the fungi. V. The growth of certain fungi in plant decoctions. Ann. Mo. 



Bot. Gard. 4:279-288. /. 1-4. 1917. 

 Foreman, F. W. ('10). The fungicidal properties of liver of sulphur. Jour. 



Agr. Sci. 3:400-416. 1910. 

 Fourcroy, A. F., et de la Porte (1790). Analyse chimique de l'eau sulfureuse 



d'Enghien, pour servir a l'histoire des eaux sulfureuses en general. Ann. de 



Chim. 6:160-175. 1790. 

 Freundlich, H., und Scholz, P. ('22). Ueber hydrophobe und hydrophile Sole 



des Schwefels. Koll. Beih. 16:234-266. 1922. 

 Harris, J. E. ('11). Lime-sulphur spray. Mich. Agr. Exp. Sta., Tech. Bui. 



6:1-15. 1911. 



