148 HORTICULTURE [BoT. Absts., Vol. VII, 



gate by cuttings than by layers; (b) nitrogenous fertilizer was beneficial, especially for 

 young vines; (c) it is advantageous to practice regular plowing and harrowing; and (d) 

 proper pruning is not only desirable but actually essential. — Pollination studies showed that 

 the varieties were practically self-sterile and that male vines and bees were necessary for 

 cross pollination. This question is now losing its importance, since the breeding work of 

 the department has produced a new race of muscadine grape varieties which are perfect 

 flowered and self-fertile. — Extensive experiments have been carried on to demonstrate the 

 value of muscadine-grape by-products, and several have been originated. — The author 

 summarizes his work as follows: "With the development of better cultural methods, greater 

 and more varied utilization and the production through plant breeding of new and im- 

 proved varieties, the Muscadine Grape industry seems to oflfer great promise of filling in the 

 future a far more important role in American viticulture than it has in the past." — E. C. 

 Auchter. 



963. Dehn, W. M., and M. C. Taylor. A chemical method for the detection in fruit of 

 a prior frozen condition. Jour. Indust. Eng. Chem. 12 : 977. 1920.— The method is based 

 upon the fact that in the freezing of fruits the sucrose concentration is decreased, with an 

 increase in the concentration of invert sugar. — Henry Schmitz. 



964. DuNLAP, H. C. The California prune and apricot growers. Monthly Bull. California 

 State Commission Hort. 8: 401-403. 1919. 



965. Ellenwood, C. W., and Paul Thayer. Thinning of apples, peaches and plums. 

 Monthly Bull. Ohio Agric. Exp. Sta. 5' : 136-140. 1920.— A brief discussion is given, including 

 reasons for thinning and the time when the practice can be followed to the greatest advan- 

 tage. General suggestions for thinning are given. — R. C. Thomas. 



966. Evans, H. H. Report of district field inspector, Vernon. British Columbia 14th 

 Ann. Rept. Dept. Agric. 1919: 24-25. 1920. 



967. Evans, H. H. Soil-fertility and crop production. Agric. Jour. [British Columbia] 

 4: 53. 1919. 



968. Fisher, Hugo. Pflanzenwuchs und Kohlensaure. [Plant growth and carbonic acid.] 

 Naturwissenschaften 8: 413-417. 1920.— See Bot. Absts., Entry 1301. 



969. FoRTiER, S. Relation to orchard irrigation practice. Monthly Bull. California State 

 Commission Hort. 7: 361-367. 1919.— See Bot. Absts. 7, Entry 1392. 



970. Ginarte, Benjamin MuiJoz. Consideraciones sobre el cultivo de la pifia en Cuba. 

 [Cultivation of the pineapple in Cuba.] Estac. Exp. Agron. Cuba Bol. 45: 1-43. 16 fig. 1919. 

 — The writer discusses the cultivation of the pineapple in Cuba under the following heads: 

 botanical classification, varieties, soils adapted to the culture, planting systems, propagation, 

 time of planting, cultivation, fertilization, picking, packing, pests, yields and returns, and 

 uses of the fruit. — John A. Stevenson. 



971. Goj6n, Carlos. Trabajos ejecutados en la estacion agricola experimental para 

 frutas tropicales, Cordoba. [Work of the experiment station for tropical fruits at Cordoba, 

 Mexico.] Rev. Agric. [Mexico] 5:109-112. 2 fig. 1919. A report of plantings made of 

 varieties of Citrus Mangifera indica, Vitis, and other tropical fruits. — John A. Stevenson. 



972. Grabham, Michael. The alligator pear. Nature 105:517-518. 1920.— Note on 

 cultivation of Persea gratissima in Madeira, where it is now in general cultivation for orna- 

 ment and fruit. From seed, the trees bear in seven to ten years, reaching full maturity in 

 twenty. — 0. A. Stevens. 



