68 HORTICULTURE [Bot. Absts., Vol. V, 



503. Ylppo. Uber das familiare Vorkommen von Icterus neonatorum gravis. [On fam- 

 ilial occurrence of Icterus neonatorum gravis.] Miinchener Med. Wochenschr. 65: 9S. 1918. 



504. Zander, L. Der Einfluss der Bastardierung auf die Honigbildung. [The influence 

 of hybridization on honey formation.] Zeitschr. Angew. Entomol. 5: 88-93. 1918. 



505. Ziegler, H. E. Zuchtwahlversuche an Ratten. [Selection experiments on rats.] 

 Festschr. 100-jahr. Best. Kgl. Wurtt. Landw. Hochschule Hohenheim 1919: 385-399. 1919. 



HORTICULTURE 



J. H. Gotjrley, Editor 



FRUITS AND GENERAL HORTICULTURE 



506. Condit, I. J. The Kaki or oriental persimmon. California Agric. Exp. Sta. Bull. 

 316: 231-266. 20 fig. 1919. — A discussion is given of the history of the persimmon, Dio- 

 spyros, Spp., its introduction into the United States and the botany of the reproductive 

 parts. Different varieties of the Oriental species of persimmon, Diospyros kaki, are discussed 

 at length from the standpoint of their morphology, astringency, soil requirements, methods 

 of propagation and care of the trees, and methods of harvesting, processing and marketing 

 the fruit. A table of analysis of different varieties of persimmons is given and a brief discus- 

 sion of the insect enemies and diseases. — W. P. Kelley. 



507. Detjen, L. R. The limits in hybridization of Vitis rotundifolia with related species 

 and genera. North Carolina Agric. Exp. Sta. Tech. Bull. 17. 25 p. 1919. — See Bot. Absts. 4, 

 Entry 562. 



508. Gardner, V. R. Pruning the apple. Missouri Agric. Exp. Sta. Circ. 90. 20 p. 

 It fig. 1920. 



509. Hendrickson, A. H. Plum pollination. California Agric. Exp. Sta. Bull. 310. 

 28 p. 5 fig. 1919. — A considerable number of varieties of two different species of plums are 

 grown commercially in California, namely, the Japanese, Primus triflora, and the European, 

 P. domestica. Of the seventeen varieties studied all except four are self-sterile. No evidence 

 of inter-sterility between different varieties was noted, but certain varieties are more effec- 

 tive pollinators than others. Comparative study of different orchards indicated that the 

 common honey bee is an effective agent in promoting cross-fertilization between the different 

 varieties of plums. — W. P. Kelley. 



510. Shaw, P. J. Fourteenth Annual Report of the Nova Scotia Agricultural College and 

 Farm. Part 5. — Report of the Professor of Horticulture. Prov. of Nova Scotia Ann. Rept. 

 Sec. for Agric. 1918: 75-100. 1919. 



511. Sheward, T. Fruit trees in pots for winter forcing. Gard. Chron. Amer. 23: 360. 

 1 fig. 1919. 



512. Smith, Arthur. A lesson on fall preparation of the ground for spring planting. 

 Gard. Chron. Amer. 23: 341-343. 1919. 



513. Truelle, A. La situation des terrains a-t-elle de 1'influence sur la richesse sac- 

 charine des pommes a cidre? [Has the location of the soil an influence on the sugar content of 

 cider apples?] Ann. Sci. Agron. Francaise et Etrangere 36: 107-116. 1919. — Pomologists have 

 always held that the soil and exposure are among the most important factors affecting the 

 chemical composition of cider fruits. Some data are published in which are given the density 

 at 15° and 1 of n 1 sugar expressed as grams of fermentable glucose. Twelve varieties of apples 

 were studied but only the most commercially important six are reported on. The data are 



