1019] , FIELD CKOPS. 829 



thought to be thP factor mentioned by Spiilnian (E. S. R., 30, p. 63G) as thp one 

 responsible lor the production of anthocyanin in the stems and leaves. 



The factor D, which exerted a visible effect only in tlie presence of L, con- 

 verted the small eye pattern into tlie Watson pattern and th(! Hf>]stein into the 

 solid, at the same time chanjring the tlower color to dark (deep reddish violet). 

 Additional factors were recognized as follows: Hi, a factor which converted 

 the small eye pattern into the Holsteln pattern ; H2, which behaved in a manner 

 similar to Hi ; B, a factor for black seed coat which also manifested itself in 

 the production of a red tipped pod and a calyx and pedimcle having more or 

 less anthocyanin pigmentation ; N, a factor for brown or buff color in the 

 seed coat pattern ; and JI, a factor for dark maroon testa pattern. 



In a cross between small eye and solid color the behavior of certain of the 

 Fs families is held to indicate that both the Holstein factors were involved. 

 The ratio of Holstein to no Holstein in the F2 w^as as 4.9 : 1, as compared with 

 tlie expected ratio of 15 : 1. Linkage iietween the two Holstein factors is 

 believed to account for the F2 results but not for tliose of the F3. It is stated 

 that no hypothesis can be suggested at the present time v/hicli will account 

 for both the F2 and the F3. 



The following pairs of factors appeared to be inherited independently of 

 each other : L and D, D and Hi, D and H::, Hi and H2, and M and N. 



Henequen in Yucatan, R. Baeba (El Ilcneqven en Yucatan. Mexico: Sec. 

 Agr. y Fomento, Dir. Agr., 1918, 3. ed., pp. 95-\-I[, pis. 3). — This comprises a 

 rather detailed account of sisal production in Yucatan. 



A giant legume as a forage crop for Cuba, IM. Cat.vino {Estac. Expt. Agron. 

 Cuba Bol. J/S (1919), pp. 29, fJgs. 7). — The production of Meihomia leiocarpa 

 for forage is described. 



Production of late or main-crop potatoes, W. Stuart (U. S. Dept. Agr., 

 Earmers' Bui. IO64 (1919). pp. 39, Jigs. 21). — Field practices and cultural meth- 

 ods employed in growing the crop are described. It is stated that approx- 

 imately 85 per cent of the potatoes produced in the United States are grown 

 as a late or main crop. 



The industrial and nutritive value of the potato in Ireland, T. Johnson 

 and C. Boyle (Dept. Agr. and Tech. Jnstr. Ireland Jour., 18 (1918), No. 4, pp. 

 443-4^1, fids. 7). — It is stated that the size of the starch grains varies with the 

 size of the tuber, the largest being found on the outer and the inner side of 

 the vascular ring. Starch content is greatest in the cortex, least in the inner 

 pith. IMoisture and total nitrogen increase from cortex to inner pith. Ex- 

 amination of the cut surface of a tuber indicates son^iewhat roughly, but 

 serviceably, the probable composition. A thick cortical layer corresponds to 

 a high starch content ; a thin layer to a large proportion of crude protein. 

 However, the unevenness in the thickness of the layers renders it necessary 

 to use whole tubers (rather than sections) in analysis. Very large tubers are 

 apt to be watery and lacking in starch. Soil and climate vary the composition 

 of the tubers. High rainfall lowers starch content. 



Rice experiments [in Trinidad], 1915—1918, J. de Verteuil and L. A. 

 Brunton (Bui. Dept. Agr. Trinidad and Tobago, 18 (1919), No. 2, pp. 98-103). — 

 This describes the results of variety, cultural, and seed selection tests with rice. 



In the variety experiments, the average yields secured during the 5-year 

 period of 1914-1918, inclusive, ranged from 17.73 barrels (2,127.6 lbs.) of 

 paddy per acre for A. H. C. to 20.39 barrels for Jerrahan. Observations on 

 varieties imported from Ceylon, India, Java, Formosa, British Guiana, and 

 Louisiana are included. Increased yields ranging from 1.91 to 6.77 bags of 

 paddy per acre were obtained from early (February) preparation of the land 

 over late (June) pi-eparation. The best results were secured with a planting 



