19101 FIELD CROPS. 141 



The same variety of T. polonicum described above was also crossed with 

 n felted, black-glumed variety of T. turgidum, similar to Rivet and with an 



average glume length of 11 mm. In this cross T. polonicum was considered 

 smooth, and classification was made by the unaided eye. The Fi generation 

 was also plotted as a curve, and the pure shorts were said to be comprised 

 of those individuals with a glume length between 9 and 13 mm. The ratio 

 Observed was 514 long and intermediate individuals to 178 short. An analysis 

 i if the population for pubescence again showed that glume length acted as an 

 Inhibitor. A study of the color revealed this inhibiting nature even more 

 strikingly, all of the fully colored individuals, with the exception of one plant 

 of ld-uiiu. glume length, being between 8 and 13 mm. Color appeared to be 

 quite independent of pubescence. 



Five long-glumed individuals were crossed with short-glumed Kuhanka to 

 ascertain whether some were homozygous for color, and the F, generation 

 plants were grown in 191G. The author states that " there is no need to 

 wait for the second generation for the results. Two individuals gave all 

 tinged, one gave all white, and two gave a mixture of tinged and whites. 

 There can be no doubt, therefore, that when the second generation is grown 

 and true shorts appear there will also appear fully colored individuals." 



The author further describes observations on plants grown from the seed 

 of a cross of strains of Rivet and Polish wheats used by Biffen (E. S. It., 36, 

 p. 738). The Fi generation was grown at Pergamino, Argentina, in 1913 and 

 was decidedly tinged. The F 2 generation was grown in 1914 at points in the 

 northern, central, and southern parts of the wheat-producing area of the 

 country. All of the individuals were colorless in the north, as in England. In 

 the center, at about the latitude of Buenos Aires, some of the short-glumed indi- 

 viduals were tinged, while in the south, in the Pampa, the colored individuals 

 were fairly well defined and were classified, giving all whites (72) among indi- 

 viduals of long and intermediate glume length and 7 colored and 23 white 

 among the short glume length. Three doubtful shorts grown in 1915 bred 

 true to short glume, but gave 7 white and 13 colored individuals. A reciprocal 

 of the cross described above gave substantially the same results. 



" The interest of the experiment, however, lies in the fact that, whereas 

 in England the color disappears and does not return in any subsequent genera- 

 tion, the result of growing Fj's, obtained in identically the same way, in Argen- 

 tina, is to prove that at any rate the color is there, and, given suitable climatie 

 conditions, will show itself. Rivet wheat, grown for comparison, had the 

 same peculiar mouse-gray color as in England and was no darker in this cli- 

 mate. The cause of the suppression of color in this particular cross must be 

 sought for in the shape of an inhibitor, brought in, either by Polish wheat and 

 meeting something in Rivet to release it, as it were, or vice versa ; for this 

 particular strain of T. polonicum crossed with colored varieties other than 

 Rivet gives colored descendants, in climatic conditions under which, crossed 

 with Rivet, they are colorless." 



Origin of the Georgia and Alabama varieties of velvet bean, H. S. Coe 

 (Jour. Amcr. Soc. Agron., 10 (1918), No. 1,. pp. 175-179. figs. 2).— This briefly 

 relates the history of early maturing mutants of Stizolobium deeringionwn 

 grown in Georgia and Alabama, which have made possible the extension of 

 velvet-bean production to the northern limits of the cotton belt. 



Variety tests of wheat, E. F. Cauthen (Alabama Col. Sta. Bui. 205 (1918). 

 pp. 135-142). — This bulletin contains the results of tests with different varieties 

 of wheat begun in 1S99 and previously noted (E. S. R., 32, p. 137), together 



