HORTICULTURE. 43 



Study on the variation of the principal acids of the juice of the grape 

 during the process of maturity, E. Gakino-Canina (Ann. R. Accad. Agr. 

 Torino, 57 (1914), pp. 233-290, figs. 6).— The experiments here reported in 

 detail included a physical and chemical study of the changes taking place in 

 the juice of different varieties of grapes during maturity and during the forma- 

 tion of wine. 



Chemical-analytic investigations on the ripening of grapes and the forma- 

 tion of wine, W. I. Baragiola and C. Godet (Landw. Jahrb., !fi (1914), N^o. 

 2, pp. 249-302, figs. 29). — The study here reported was conducted with grapes of 

 the Piiiuschling variety taken from 18-year-old vines growing at the Wadenswil 

 experiment station. The various chemical changes which take place during the 

 ripening of the grapes and during the formation of wine from the grapes are 

 I)resented in tabular form and discussed. References to cited literature are 

 included. 



The native persimmon, W. F. Fletchee {U. S. Dept. Agr., Farmers' Bui. 

 685 {1915), pp. 28, figs. 17). — ^An account of the native persimmon with reference 

 to its botanical classification, natural distribution, distinguishing characteristics, 

 possibilities of improvement, present status of development, propagation, culti- 

 vation, diseases and insect pests, uses of the persimmon tree, uses of the per- 

 simmon fruit, and selected and cultivated named varieties. 



Dates of Egypt and the Sudan, S. C. Mason (U. S. Dept. Agr. Bui. 271 

 (1915), pp. 40, pis. 16, figs. 9). — ^This bulletin contains descriptions of 22 

 varieties of dates of Egypt and the Sudan comprising most of the commercial 

 dates of those regions, together with several varieties of minor importance not 

 heretofore ■ published. A general descriptive account is given of Nile Valley 

 dates and their climatic environments. 



Successful long-distance shipment of citrus pollen, Maude Kjellerman 

 (Science, n. ser., 42 (1915), No. 1081, pp. 375-377). — Shipments of citrus pollen 

 were made from Florida to Japan for use in making hybrids in the variety col- 

 lection of citrus fruits at the Imperial Horticultural Experiment Station at 

 Okitsu, Shidzuoka Ken. The viability of this pollen in 30 per cent cane-sugar 

 .solution was tested by Y. Kumagai of the above station. Different methods were 

 used in preparing the pollen for shipment. 



The i-esults of the test shov/ conclusively that pollen can be successfully 

 shipped from Florida to Japan and be in a viable condition on arrival four to six 

 weeks after it is gathered. The most promising method for shipping the pollen 

 over long distances appears to be that of drying the anthers in vacuum over 

 sulphuric acid. The vacuum glass tubes were filled with 1 to 2 in. of anthers, 

 covered with half an inch of cotton, exhausted to about 0.5 mm. pressure in the 

 presence of sulphuric acid, and the tube was then sealed. As far as practical 

 the pollen was kept at a temperature of 10° C. until sealed. 



Washington navel orange, A. D. Shamel (Jour. Heredity, 6 (1915), No. 10, 

 pp. 435-445, figs. 6). — A paper read before the American Genetic Association 

 on August 3, 1915, at Berkeley, Cal., in which the author brings together the 

 available information concerning the origin and development of the Washington 

 navel orange. The importance of bud mutations as observed in the author's in- 

 vestigations with navel oranges (E. S. R., 32, p. 439) is also discussed. 



Sixty years of tea, coffee, and cacao, J. J. Macfaklane (Tea and Coffee 

 Trade Jour., 29 (1915), No. 3, pp. 230-233, figs. 6).— Charts are given showing 

 the five-year averages of the quantity and value of imports of tea, coffee, and 

 cocoa into the United States, the import price per pound, and the per capita con- 

 sumption for a period of sixty years from 1851 to 1914. 



Experiments at the medicinal plant experiment station of the Agricultural 

 Academy at Klausenburg in 1914, B. Patek (Kis&rlet. Kozlem., 18 (1915), 



