258 Journal of Agricultural Research voi.xnr, no. 4 



(2) Wind-blown sand as an ultimate cause of the formation of intum- 

 escences on cabbage appears not to have been previously reported. 



(3) The proximate cause of these intumescences is believed to be a 

 problem of absorption and is due to a heightened hydration capacity of 

 the cell colloids resulting from acids produced by oxidation. 



LITERATURE CITED 

 (i) Atkinson, G. F. 



1893. CEDEMA OF THE TOMATO. N. Y. Comell Agr. Exp. Sta. Bui. 53, p. 

 75-108, 8 pi. 



(2) Dale, Elizabeth. 



1901. investigations on the abnormal outgrowths or intumescences on 

 HIBISCUS vitipouus. In Phil. Trans. Roy. Soc. London, s. B, v. 194, 

 p. 163-1S2, 2 figs. 



(3) Fischer, M. H. 



1905. (EDEMA AND NEPHRITIS. A critical, experimental, and clinical study of 

 the physiology and pathology of water absorption in the living organ- 

 ism, ed. 2, 695 pp. New York. Bibliography, pp. 671-673. 



(4) KusTER, Emst. 



1903. Pathologische Pflanzenanatomie . . . 312 pp., illus. Jena. 



(5) NOACK, F. 



1901. TREiBHAUSKRANKHEiT DER WEINREBE- In Gartcnflora, Jahrg. 50, 

 Heft 23, p. 619-622. 



(6) PriluEux, E. E. 



1892. intumescences sur les feuillES d'oEillets maladies. In Bui. Soc. 

 Bot. France, t. 39, p. 370-372. 



(7) Rosen, H. R. 



1916. THE development op THE PHYLLOXERA VASTATRIX LEAF GALL. In 



Amer. Jour. Bot., v. 3, no. 7, p. 337-360, 5 fig., pi. 14-15- Bibliography 

 p. 358-360. 



(8) ScHRENK, Hermann von. 



1905. intumescences formed as a result of chemical stimulation. In 

 Mo. Bot. Card. i6th Ann. Rpt., p. 125-148, pi. 25-31. Bibliography, 

 p. 146-148. 



(9) Smith, Erwin F. 



1917. EMBRYOMAS IN PLANTS. (PRODUCED BY BACTERIAL INOCULATIONS.) In 



Bul. Johns Hopkins Hosp., v. 28, no. 319, p. 277-294, pi. 26-53. 



(10) 



1917. MECHANISM OF OVERGROWTH IN PLANTS. In Proc. Amer. Phil. Soc, V. 

 56, no. 6, p. 437-444. 



(11) 



1917. MECHANISM OF TUMOR GROWTH IN CROWNGALL. 7w Joiu". Agr. Research, 

 v. 8, no. 5, p. 165-188, pi. 4-65. Literature cited, p. 185-186. 



(12) SORAUER, Paul 



Handbuch der Pflanzenkrankheiten . . . Aufl. 2, T. i. Berlin. 



(13) 



1890. MITTEILUNGEN AUS DEM GEBIETE DER PHYTOPATHOLOGIE. II. Die 



symptomatische Bedeutung der Intumescenzen. In Bot. Ztg., 

 Jahrg. 48, No. 16, p. 241-251. 



(14) 



1899. UEBER INTUMESCENZEN. In Ber. Deut. Bot. Gesell., Bd. 17, Heft 10, p. 

 456-460, illus. 



