34 EXPERIMENT STATION" RECORD. [Vol.40 



denee of linkage between waxy endosperm and aleurone color in certain hybrids 

 of Chinese and American corn, the author states that he " has presented addi- 

 tional evidence from back crosses, which shows the intensity of the linkage in 

 the material at his disposal to be equivalent to 2G.7 per cent of crossing over. 

 It has been shown directly, by means of crosses between colorless individuals in 

 a linkage family and aleurone testers and indirectly by means of aleurone tests 

 with a nonlinkage family where the A factor and not the C factor is hetero- 

 zygous, that the C factor for aleurone is linked with the factor for waxy 

 endosperm." 



Corn culture in South Dakota, M. Champlin and G. Wineight (South Da- 

 kota Sta, Bui. 181 (1918), pp. 852-911, figs. 34). —The results of variety, crop 

 rotation, and cultural tests with corn conducted on the Brookings, Cotton- 

 wood, Eureka, and Highmore experiment farms are noted, and the cultural 

 methods and field practices deemed best for growing the crop in the State 

 outlined. A number of corn varieties grown in the State are illustrated and 

 briefly described. 



South Dakota is said to be peculiarly adapted to growing seed corn for the 

 States to the north and west, where corn is grown for roughage but does not 

 as a rule mature seed. Adapted varieties for different sections of the State are 

 recommended. Fall plowing for corn at a depth of from 6 to 8 in. is held to be 

 desirable, while subsoiling was not warranted by the results obtained. Sys- 

 tematic crop rotation, preferably including a legume, is deemed essential to 

 successful corn production. The selection and storage of seed corn is de- 

 scribed, and some of the diseases affecting the crop are indicated. 



Budding incompatible cottons (Jour. Heredity, 9 (1918), No. 4, p. 181).— X 

 brief description is given of experimental work conducted by R. M. Meade in 

 budding American upland cotton (Gossujiium hiisuum) on two Asiatic species 

 (G. herbaeeum and G. indicum), in an effort to overcome a seeming chemical 

 incompatibility which caused the shedding of the young bolls when the usual 

 methods of cross-pollination were employed. Several successfully budded plants 

 were secured, but they were obtained so late in the season that only one budded 

 branch produced flowers, and that at a time when no flowers were open on the 

 stock plant. 



That the sap of the stock may alter the chemical composition of the budded 

 branches is thought to have been indicated by an experiment in budding two 

 distinct upland varieties. Willet Red Leaf, which has dark red foliage and 

 stems, was employed for the bud wood, and Trice, a normal green variety, was 

 used for stock. The first leaves on the budded branches were red in color like 

 the bud parent, but succeeding leaves grew lighter In shade until at the end 

 of the season they were only half as dark. 



Length of cotton lint, crops 1916 and 1917, W. L. Pryob (17. S. Dept. Agr. 

 Bui. 7S3 (1918), pp. 8). — Statistical data relating to the production, distribu- 

 tion, yield, and price per pound of long staple cotton during 1916 and 1917 

 are presented and discussed as the result of an inquiry made in December, 

 1917. The principal areas of production of extra-length cotton are said to in- 

 clude the alluvial sections of Mississippi and Arkansas, eastern and north- 

 western Louisiana, northeastern Texas, eastern Oklahoma, and northeastern 

 South Carolina. In addition, Sea Island, Egyptian, and Durango cotton were 

 grown in certain sections of Georgia, Florida, South Carolina, Arizona, and 

 California. The damage done to the cotton crop by weather and insects during 

 1917 is briefly noted. The qualities required for spinning and differences in 

 classification of cotton accordiug to length of staple in both American and 

 English markets are indicated. 



