FIELD CROPS. 327 



Effect of high frequency currents on plants, K. Homberger (Umschau, 18 

 (1914), No. 36, pp. 733-735, figs. 2; abs. in Intcrnat. Inst. Ayr. [Rome], Mo. Bui. 

 Agr. Intel, and Plant Diseases, 5 (1914), No. 11, pp. 1430, 1431).—The author 

 carried out experiments with several common vegetables along the same gen- 

 eral lines as those followed by Lemstrom, Lodge, and others (E, S. R., 20, 

 p. 930; 21, p. 317), by employing alternating electrical currents of very high 

 potential and rapidity of oscillation. It is claimed that the large increase In 

 growth and in chlorophyll formation was due to the oscillating field and not to 

 heat generated by the current. 



The influence of chloroform on assimilation by chlorophyll, K. von Korosy 

 (Hoppe-Seylefs Ztschr. Physiol. Chcm., 93 (1914), Xo. 1-2, pp. 145-153, fig. 1).— 

 The author found in experiments with Elodea canadensis that a 0.074 per cent 

 solution of chloroform lowered chlorophyll assimilation by tliis plant. 



Internal factors regulating- plant growth, R. Dostax (Biol. lAsty, 1914, P- 

 205; abs. in Bot. Centbl., 12'5 (1914), No. 23, p. 585).— This is a study of the 

 developmental correlations observable within the plant itself. 



The author found that parts of a stem of Scrophularia nodosa, bearing a few 

 leaves, when cultivated separately developed from the basal portions root-like 

 structures, from the middle portions leaves, and from the terminal portions 

 flower buds. It is held that under normal conditions the leaves regulate develop- 

 ment in their axillary buds and affect likewise that of neighboring portions of 

 the stem. The leaves exert an influence upon floral development. The activity 

 of the cotyledons also shows a correlation with the development of their axillary 

 and higher buds. This is probably to be ascribed to the organic material given 

 up by the cotyledon, as on its exhaustion (especially in carbohydrates) the 

 correlation decreases or disappears. 



Green leaves do not appear to regulate stem development, but they do appear 

 to influence root development, as do also other organs as a rule. 



Cell adjustment following decapitation and inversion of shoot, F. Neeff 

 (Ztschr. Bot., 6 (1914), No. 6, pp. 465-547, pi. 1, figs. 32).— This is a contribu- 

 tion to experimental anatomy of plants, being an account of studies, with bibli- 

 ography, regarding the effect of decapitating or inverting a growing shoot on the 

 laterals, as shown by the resulting position and arrangement of the cells, fibers, 

 and tissues and the relations of the cambium thereto. 



The rise of sap in trees, Faeenholtz (Naturwissenschaften, 2 (1914), No. 

 24, pp. 594, 595; abs. in Bot. Centbl., 126 (1914), No. 21, p. 549).— This is a 

 discussion of the more important views offered up to this time regarding the 

 causes of sap ascent in trees. 



Inventory of seeds and plants imported by the OflB.ce of Foreign Seed and 

 Plant Introduction during the period from January 1 to March 31, 1913 

 (U. S. Dept. Agr., Bur. Plant Indus. Inventory No. 34 (1915), pp. 51, pis. 6).— 

 This inventory gives economic notes regarding about 400 plant introductions, 

 the material being largely contributed by correspondents in various foreign 

 countries who have sent the material either in response to requests or on their 

 own initiative. 



FIELD CROPS. 



Management of irrigated land, F. Knorr (Nebraska Sta. Bui. 152 (1915), 

 pp. 5-24). — This bulletin briefly discusses various phases of irrigation and gives 

 r'esults of the effect of fall irrigation on potatoes, corn, beets, barley, wheat, 

 and oats for 1911, 1912, and 1913 at the Scottsbluff substation, in cooperation 

 with the Bureau of Plant Industry of the U. S. Department of Agriculture. 



