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32. Thomas, M. D., R. H. Hendricks, T. R. ColUer, and G. R. Hill, "The utilization of 



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33. , , J. O. Ivie, and G. R. Hill, "An installation of large sand-culture beds 



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34. , and G. R. Hill, "Relation of sulphur dioxide in the atmosphere to photosyn- 

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36. Walker, J. C., M. A. Stahmann, and D. A. Pryor, "Efficacy of fungicidal trans- 



planting liquids for control of clubroot of cabbage," Phytopath., 34 : 185-195 

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37. Weedon, F. R., A. Hartzell, and C. Setterstrom, "Effects on animals of prolonged 



exposure to sulphur dioxide," C. B. T. I., 10 : 281-324 (1939). 



38. , , , "Toxicity of ammonia, chlorine, hydrogen cyanide, hydrogen 



sulphide, and sulphur dioxide gases. V. Animals," C. B. T. I., 11 : 365-385 

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39. Zimmerman, P. W., and R. O. Berg, "Effects of chlorinated water on land plants, 



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40. , and W. Crocker, "Sulfur dioxide injury to plants," Proc. Am. Soc. Hort. Sci., 



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41. , , "The injurious effect of mercury vapor from bichloride of mercury in soil 



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42. , , "Plant injury caused by vapors of mercury and compounds of mercury," 



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43. , , "Toxicity of air containing sulphur dioxide gas," C. B. T. I., 6 : 455- 



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