42 BULLETIN 907, U. S. DEPARTMENT OF AGRICULTURE. 



LITERATURE CITED. 



(1) Clayton, E. E. 



1919. hydrogen CYANIDE fumigation. In Bot. Gaz., v. 67, no. 6, p. 483- 

 500, 2 fig. (Literature cited, p. 500.) 



(2) Coit, J. E., and Hodgson, R. W. 



1919. an investigation of the abnormal shedding of young fruits 



OF THE WASHINGTON NAVEL ORANGES. Ill UniV. Cal. Pub., Agr. 



Sci., v. 3, no. 11, p. 283-368, 9 fig., pi. 25-42. (Literature cited, p. 

 368.) 



(3) COQUILLETT, D. W. 



1891. REPORT ON VARIOUS METHODS FOR DESTROYING SCALE INSECTS. THE 

 GAS TREATMENT FOR THE RED SCALE. U. S. Dept. Agr. Div. Ent. 



Bul. 23 (o. s.), p. 20-27. 



(4) Duggar, B. M. 



1912. plant physiology. 516 p., illus. New York. 



(5) Tower, W. V., and Hooker, Charles W. 



1910. fumigation dosage. (With introductions by H. T. Fernald.) 

 In 22nd Rpt. Mass. Agr. Exp. Sta., pt. 1, p. 214-247. 



(6) Fowler, L. W., and Lipman, C. B. 



1917. optimum moisture condition for young lemon trees on a 



loam soil. In Univ. Cal. Pub., Agr. Sci., v. 3, no. 2, p. 25-36, pi. 

 9-11. Sept, 29. 



(7) Gossard, H. A. 



1903. white fly (aleyrodes citri). Fla. Agr. Exp. Sta. Bul. 67, p. 599- 

 666, pi. 6. 



(8) Harvey, R. B. 



1918. hardening process in plants and developments from frost 



injury. In Jour. Agr. Research, v. 15, no. 2, p. 83-112, 3 fig., pi. 

 7-11, A. (Literature cited, p. 108-111.) 



(9) Lloyd, F. E. 



1908. the physiology of stomata. Carn. Inst. Wash. Pub. 82, 142 p., 14 pi: 

 (Bibliography, p. 141-142.) 



(10) MacDougal, D. T. 



1901. PRACTICAL TEXT-BOOK OF PLANT PHYSIOLOGY. 352 p., 159 fig. New 



York, London, and Bombay. 



(11) Moore, William. 



1916. studies in greenhouse fumigation with hydrocyanic acid: 



temperature and moisture as factors influencing the injury 

 of plants during fumigation. In 16th Rpt. State Ent. Minn., 

 1915/16, p. 93-108, fig. 23-27. (Literature cited, p. 108.) 



(12) Moore, William, and Willaman, J. J. 



1917. studies in greenhouse fumigation with hydrocyanic acid: 



physiological effects on the plant. In Jour. Agr. Research, 

 v. 11, no. 7, p. 319-338, 11 fig., pi. 34. (Literature cited, p. 336- 

 338.) 



(13) Morrill, A. W. 



1908. fumigation for the citrus white fly, as ADAPTED TO FLORIDA 

 conditions. U. S. Dept. Agr. Bur. Ent. Bul. 76, p. 73, 11 fig., 7 pi. 



(14) Penny, C. L. 



1900. the diffusion of hydrocyanic acid vapor in an enclosed space. 

 In Del. Agr. Exp. Sta. 12th Ann. Rpt., p. 218-235, fig. 2-4. 



(15) Pfeffer, Wilhel.m. 



1903. physiology of plants. Ed. 2. Trans, and ed. by A. J. Ewart. 

 v. 2, 296 p., illus. Oxford. 



