240 EXPERIMENT STATION EECOED. 



TlM' .ueiun-al conclusions drawn from this work as presented by H. W. 

 Wiley are in substance as follows: The content of sugar in sweet corn does 

 not depend so much on tomi)erature and length of day as in the case of the 

 sugar beet. The amount and distribution of rainfall appears to be the most 

 important factor affecting the edible quality of green Indian corn, a moderate 

 and well-distributed rainfall, especially during the growing season, being nec- 

 essary to produce a crop having the best qualities. As reported earlier in the 

 investigations by the Maryland Station (E. S. R., 19, p. 840), the sugar content 

 of sweet corn rapidly diminishes after the ear is separated from the stalk. 

 Under ordinary conditions of storage the speed of diminution is more rapid 

 with a higher and slower with a lower temperature. The disappearance of 

 the sugar is attributed to the continued growth of the grains of the ear and 

 the transformation of the sugar into starclj or some other form of nonsaccharine 

 carbohydrate. A higher average sugar content was found in the corn grown 

 in South Carolina and in Florida than that grown in Connecticut and in Maine, 

 but the chief difference between the sweet corn of the extreme North and the 

 extreme South is found not so much in its sugar content as in Its succulence, 

 the lower temperatures of the North making the corn more tender and edible 

 for a longer period than the extremely high temperatures of the South. The 

 superiority in sugar content of the southern corn suggests the possibility of 

 acclimating the most favorable varieties, and by selection and careful cultivat- 

 ing greatly improving the southern grown product. The data secured from 

 the work as a whole indicate that curves showing variations in temperature, 

 latitude and altitude, the amount of sunshine, and the quantity and distribu- 

 tion of the rainfall can not be so readily compared with the lines showing the 

 sugar content as in the case of the sugar beet. 



Mang'anese in some of its relations to the gro^vth of pineapples, W. P. 

 Kelley {Jour. Indus, and Engiii. Chcm., 1 (1909), No. 8, pp. 533-538; abs. in 

 Jour. Sac. Chcm. Indus., 28 {1909), No. 11, pp. 9^8, 9^9; Chem. A&s., 3 (1909), 

 No. 21, p. 2605).— This has been noted from another source (E. S. R., 21, p. 139). 



Climatology and soil and their influence on fruits, T. II. McHatton (Oa. 

 Bd. Eiit. Bui. 21, pp. Jtl-52). — A brief general discussion of this subject in rela- 

 tion particularly to the more important Georgia fruits, including the peach, 

 plum, apple, pear, and grape. 



[Experiments in orchard heating], J. L. Hamilton et al. (Aim. Rpt. Bd. 

 Ilort. Colo., 1909, pp. 41-56). — Accounts are given of the experience of different 

 Grand Junction fruit growers in the use of orchard heaters for protecting the 

 crops against frost. 



The history and relationship of the citron (Citrus medica), E. Ferrari 

 (Atti R. 1st. Iiiconigg. Xdpoli. 6. scr., 1 (1909) , pp. 21) . — A study of the citron, 

 in which consideration is given to its natural and cultural range, its history, 

 and its botanical, biological, and chemical relationships with other citrus fruits. 

 A bibliography of the literature consulted is included. 



Fig culture, A. C. Van Velzkr (Houston, Tex., 1909, pp. 218, j}ls. 2. figs. 52, 

 dgms. 3). — This work is offered as a statement of the history, variety, and 

 botany of the fig in Asia, Africa, and America, and a special treatise of its 

 propagation, cultivation, and curing in North America. It combines informa- 

 tion gained from field investigations by the author with that gained from 

 prevous literature on the subject. The preface contains an extensive bibliog- 

 raphy for collateral reading. 



Report of the government viticultural expert for the year 1903, R. Dubois 

 (Cape Good Hope Dept. Agr., Rpt. Govt. Vit. Expert, 1903, pp. 23). — 'In this 

 report the author outlines the various branches of work which the viticultural 

 branch of the Cape of Good Hope Department of Agriculture planned to take 



