1916] FIELD CROPS. 443 



subjecting the first, third, and fifth of these to germination tests, and averag- 

 ing the results on a percentage basis. 



Sugar cane experiments in the Leeward Islands, H. A. Tempany et al. 

 (Imp. Dept. Agr. West Indies, Sugar-cane Expts. Leetcard Isl., 1914-15, pts. 

 1-2, pp. 76). — These experiments included variety tests and fertilizer trials 

 conducted in Antigua and St. Kitts in 1914-1.5 and in previous years. The data 

 secured are shown graphically and in tabulated form and are briefly discussed. 



In the variety tests conducted in Antigua the leading plant canes and their 

 yields per acre were as follows : B. 6308 produced 3,560 lbs. of sucrose from 22 

 tons of cane per acre and B. 6450 yielded 3,100 lbs. from 19.3 tons. B. 3412 

 gave 2,980 lbs. of sucrose per acre and B. 3922, 2,940 lbs. In average produc- 

 tion during the past 14 years Sealy Seedling stood first with 6,570 lbs. of 

 sucrose per acre in the juice, B. 208 second with 6,410 lbs., and B. 156 third 

 with 6,290 lbs. The results with ratoon canes the past 13 years placed Sealy 

 Seedling first with 3,720 lbs. of sucrose per acre in the juice, followed by 

 B. 156 with 3,600 lbs., and B. 306 with 3,560 lbs. 



In the work with varieties in St. Kitts during the year 1914—15, D. 110 headed 

 the list with a yield of 5,680 lbs. of sucrose per acre in the juice, being followed 

 by B, 376 with 5,510 lbs., and Sealy Seedling with 5,450 lbs. The leading 

 ratoon canes were B. 1753, yielding 5,300 lbs. of sucrose per acre in the juice. 

 D. 116 yielding 4,940 lbs., B. 1528 yielding 4,760 lbs., and Sealy Seedling 

 4,610 lbs. 



Experiments carried out at Round Hill, Nevis, during this year place Sealy 

 Seedling first in productiveness with a yield of 5,470 lbs. of sucrose per acre in 

 the juice, followed by A. 2 with 4,910 lbs., and B. 1528 with 4,510 lbs. 



From the results of the fertilizer trials it is concluded that under average 

 conditions the amounts of maniu'ial constituents supplied in 20 tons of barn- 

 yard manure per acre applied before the crop of plant cane is established pro- 

 vides sufficient plant food for the production of a crop of plant canes, first 

 ratoons, and possibly second ratoons. An additional application of commer- 

 cial fertilizers, due to the limitation of the moisture supply, is unattended by 

 corresponding increases. 



Investigations of the anatomical structure of the leaves of different varie- 

 ties of spring wheat and its significance in breeding, W. Heusee {Ztschr. 

 Pflanzenzliclit., 3 {1915), No. 3, pp. 335-352) .—This article is devoted partly 

 to a study of the differences in leaf structure of a number of varieties of spring 

 wheat, and partly to a presentation of different views regarding the significance 

 of the size of the plant cell. 



The experimental study of the anatomy of wheat leaves, according to the 

 author, showed that varieties comparatively xerophytic in type are character- 

 ized by small size of cell. In this connection attention is called to the fact 

 that Kolkunoff bases selection on the small size of cells in breeding for drought 

 resistance. The author questions the advisability of selecting small cell types 

 of wheat for culture under the conditions obtaining in Germany, but suggests 

 the selection of large-celled and small-celled forms from the wheat varieties 

 commonly grown to compare them with reference to the rate of development 

 and to the morphological and physiological characters that distinguish them. 

 Marquis wheat, C. R. Ball and J. A. Clark ( U. S. Dept. Agr., Farmers' Bui. 

 732 {1916). pp. 7, figs. 2). — The history and description of Marquis wheat are 

 given, and its value for the subhumid, semiarid, arid, and irrigated sections is 

 discussed. The recommendations given are based largely on the results secured in 

 13 States in experiments with Marquis wheat by this Department and a number 

 of experiment stations. 



