FIELD CROPS. 131 



land, dry land, and wet land. Rotation experiments on these lands include 

 peanuts, cotton, " tenai " (Setaria italica), " cumbu " (Pennisetum typlioid- 

 eum), and " ragi " {Eleusine coracana). 



Results covering a period of seven years show that growing a cereal with 

 peanuts gave an increased net profit per acre, although the yield of peanuts 

 was less than when that crop was grown alone. Manurial tests included bone 

 meal, burnt shell lime, powdered shell, peanut stalks, shells, and cake, and 

 pit manure. Using a green manure crop, " daincha " (ScsMnia aaileata), in 

 the production of rice proved very beneficial. 



A handbook of Nebraska grasses, E. M. Wilcox, G. K. K. Link, and Venus 

 W. Pool {Nebraska Sta. BuL US (1915), pp. 5-120, figs, ii^).— Nearly 150 

 species are identified, and a bibliogi-aphy of publications of the TJ. S. Depart- 

 ment of Agriculture and the state experiment stations on agrostology is ap- 

 pended. 



The Spanish grasses of northern Africa, C. Manetti (Agr. Colon. [Italy], 

 8 {19U), Nos. 9, pp. 553-57G, pis. 4, figs. 9; 10, pp. 641-663, pis. 4, figs. 5; 11, 

 pp. 743-763, figs. 10; 12, pp. 815-830, fig. i).— This series of articles constitutes 

 a very complete treatise on the Spanish grasses (Stipa tenacissima, Lygeum 

 spartum, Ampeloclesma mauritanica, and AHstida pungens), covering their cul- 

 tivation, improvement, uses, and enemies. 



Agave. — Its culture and exploitation, F. Michotte {U Agave. Culture et 

 Exploitation. Paris: A. CJiallamcl, 1914, PP- S39, figs. 113). — A treatise con- 

 taining a study of this plant, its exploitation and culture, the extraction of the 

 fiber, and the utilization of the plant and its products. 



First series of researches with reference to red clover breeding, H. M. 

 Gmelin (Meded. Rijks Hoogere Land., Tuin en Bosehhouwsch. [Wageningen], 

 7 {1914), No. 5, pp. 149-165). — This describes methods of employing the bumble- 

 bee in the seed production of red colver, and gives results of observations upon 

 several varieties of red clover and the effect of different insects upon the 

 fertilization of the flowers. 



A genetic and cytological study of certain types of albinism in maize, 

 F. 0. Miles {Jour. Genetics, 4 {1915), No. 3, pp. 193-214, pi. 1, figs. 9).— This 

 article briefly reviews previous investigations along this line, gives results of 

 work conducted at the Nebraska Experiment Station in the inheritance of 

 albinism in maize, and includes an anatomical study of the leaves of certain 

 types of maize. 



" From the studies of the various categories it appears that in all cases, 

 with the possible exception of the striped leaves in Zea japonica, the several 

 degrees of albinism in corn leaves behave as simple Mendelian recessives; the 

 first generation of a cross with ordinary green races giving fully green plants 

 and the second generation segregating in the ratio of three grecu plants to 

 one plant of the particular type which was used in tlie cross. The study of 

 the manner of inheritance of variegated leaves of Z. japonica in crosses where 

 aleurone color is involved has not been completed. 



"A rather definite relation has been pointed out between a pure white type 

 of maize plant and a yellowish-white type, the results indicating that the 

 presence of at least two factors is necessary for the development of normal 

 green in the leaves of maize. In the absence of one of these factors the plant 

 is pure white and soon dies, while in the absence of the other factor the plant 

 at first is yellowish white but is capable of developing into a greenish condi- 

 tion and sometimes into a pure green plant. 



" Studies of the relation between the other categories have not been com- 

 pleted. Crosses of striped plants of the japonica type with golden plants, and 



