40 EXPERIMENT STATION EECORD. 



tail, found in 113 samples, being the most common. In 11 samples of awnless 

 bromo grass, 14 different weeds were fouiul, clH'at. found in 8 samples, being 

 the most common. 



Constant problems in modern agriculture, K. von Rumkeb {Tagcsfnujcn aus 

 (1cm modcnicii Ackcrbait. Berlin, lUUD, pp. VII+-o98, figs. 2). — This book is 

 made up of 10 numbers of a publication appearing irregularly since 1901. 

 The first number has reference to soil and its cultivation, the second to the 

 use of fertilizers, the third to barnyard manure and green manuring, the fourth 

 to crop rotations, the fifth to the proper selection of varieties for certain con- 

 ditions of soil and climate, the sixth to variety selection of hoed crops and the 

 methods of variety testing, the seventh to seed growing and seed growers' 

 associations, the eighth to seed and its care, the ninth to weed destruction, 

 and the tenth to the harvest and the storing of crops. Bibliographies on a 

 number of the different subjects are included. 



[Agricultural products of Japan], C. Shimooka (In Agriculture in Japan. 

 Tokyo: Govt.. 1908, pp. 157-239). — These pages treat of the staple and special 

 field crops grown in Japan. 



HORTICULTURE. 



The inheritance of color in the seeds of the common bean (Phaseolus 

 vulgaris), R, A. Emerson (Nebraf^ka Sta. Rpt. 1908, pp. 65-101, figs. //).— This 

 is a further report upon the author's hybridization studies of beans, some of 

 the results of which have been noted (E. S. R., 16, p. 563). In this paper the 

 numerical relations in respect to color inheritance secured with the various 

 hybrids are presented and discussed, both with reference to Mendelian prin- 

 ciples and in connection with the results reported by other investigators along 

 the same line. 



In the many crosses made illustrating the inheritance of pigment in bean 

 seeds, the presence and absence of pigment were found to constitute an allelo- 

 morphic pair inherited in typical Mendelian fashion (E. S. R., 13, p. 744) 

 Certain exceptions which occurred are attributed to the small numbers dealt 

 with in those cases. 



In respect to total and partial pigmentation, the writer finds that the latter 

 condition usually appears around the " eye " of the seed, being confined to a very 

 small spot about the hilum in some races and covering as much as four-fifths of 

 the surface of the seed in others. He is of the opinion that thei'e are no dis- 

 tinct factors for pigmentation about the eye and for pigmentation of the back of 

 the bean. " It is simply a matter of whether the pigment extends over the 

 entire surface of the seed or only over a part (large or small) of it." When 

 totally pigmented beans were crossed with partially pigmented (eyed) beans, 

 total pigmentation occurred exclusively in the first generation hybrids, the 

 eyed form reappearing in the second generation hybrids and breeding true 

 in subsequent generations. Of the totally pigmented second generation hybrids 

 some have bred true while others on being self-fertilized yielded both totally 

 pigmented and eyed forms. 



In a number of crosses of eyed beans with nonpigmented (white) beans, the 

 first generation hybrid plants produced totally pigmented seeds. In the second 

 generation hybrids of these crosses totally pigmented, eyed, and white seed 

 were produced. On the other hand, these same white races when crossed with 

 totally pigmented ones yielded no eyed individuals in the second generation 

 hybrid plants. The conclusion is reached that total pigmentation is latent in 

 these particular races of white beans, such as the Davis, Jones Stringless. and 

 Navy, Mottled pigment-paittern was dominant to self-color, both conditions 



