436 
Journal of Agricultural Research 
Vol. XI, No. 9 
(13) Gas generated in a soil body diffuses with extreme slowness in 
clay soils or very wet sandy soils, but in sand with a medium amount of 
moisture, the diffusion of gas is much more rapid. 
(14) The use of sodium cyanid offers a satisfactory means of fumi¬ 
gating masses of loose, porous sod, especially those with only small 
amounts of clay, or of seed beds and potting soil. Such treatments 
allow of much wider range of concentrations when the soil is not occupied 
by a crop. 
LITERATURE CITED 
(1) Bourcart, E. 
1913. insecticides, fungicides and weedkillers. Translated by Donald 
Grant. 431 p. } 12 fig. London, New York. 
Cites Mouillefert, p. 136-137. 
(2) Fernald, H. T. 
• 1910. fumigation dosage. In Mass. Agr. Exp. Sta., 22d Ann. Rpt., 1909, 
p. 214-247. 
(3) France. MinistEre de l'Agriculture ET du Commerce. Commission Sup£- 
riEurE du Phylloxera. 
1880-1882. compte rendue et pieces annexes, 1879-1881. 
(4) MammElle, Th. 
1910. SUR l’Emploi du cyanure de potassium comme insecticide souter- 
rain. In Compt. Rend. Acad. Sci. [Paris], t. 150, no. 1, p. 50-52. 
(5) Morse, F. W. 
1888. EXPERIMENTS ON THE CAUSE AND AVOIDANCE OF INJURY TO FOLIAGE IN 
THE HYDROCYANIC GAS TREATMENT OF TREES. Cal. Agr. Exp. Sta. 
Bui. 79, 3 p. 
(6) Sanderson, E. D. 
1907. DIRECTIONS FOR TREATMENT OF INSECT PESTS AND PLANT DISEASES. In 
N. H. State Bd. Agr. Rpt., 1905/07, p. 151-175. 
(7) Stone, G. E. 
1913. THE INFLUENCE OF VARIOUS LIGHT INTENSITIES AND SOIL MOISTURE ON 
THE GROWTH OF CUCUMBERS, AND THEIR SUSCEPTIBILITY TO BURNING 
from hydrocyanic acid gas. In Mass. Agr. Exp. Sta., 25th Ann. 
Rpt., [1912], pt. 1, p. 61-72, 3 pi. 
(8) Warren, G. F. 
1907.' fumigation for the white fly (alEyrodes). In N. J. Agr. Exp. Sta., 
27th Ann. Rpt., [19051/06, p. 242-247, 2 pi. 
