1916] HORTICULTURE. 449 



matic conditions, methods of propagation, planting and culture, diseases and 

 insect pests, harvesting, commerce, and cost of production. 



Pamburus, a new g'enus related to Citn.is, from India, W. T. Swingle 

 (Jour. Wash. Acad. Sci., 6 {1016), No. 11, pp. 335-338).— In this article the 

 author names and describes a new genus, Pamburus, to include certain species 

 related to Citrus which have previously been referred to the genus Atalantia. 



Olive culture in the environs of Trapani, D. Poma {Ann. R. Staz. Sper. 

 Agrum. e Frutticol. Acireale, 3 {1915), pp. 111-134).— A survey of the olive 

 industry in the environs of Trapani, conducted with the view of determining 

 the causes of the decline in the industry. The results of the survey indicate 

 in brief that under better methods of culture and care olive growing might 

 well be extended in that region. 



Variation in the flowers of the papaya, L. B. Ktjlkakni {Poona Agr. Col. 

 Reprints No. 4 {1915), pp. 11, pis. 3). — Observations made by the author in the 

 Ganeshkhind Gardens during the years 1910-1913 show that the inflorescence 

 of the male plants of the dioecious type of papaya is unstable. At certain 

 times staminate, pistillate, and hermaphrodite flowers have been observed. 

 With the increase of hermaphrodite flowers there is a decrease of staminate 

 flowers and a gradual appearance of pistillate flowers. At other times the 

 pistillate flowers practically disappear, the number of hermaphrodite flowers 

 is decreased, and the number of staminate flowers increased. 



The results of these observations together with the results of some experi- 

 ments in beheading male plants, lead the author to conclude that, contrary to 

 the opinion advanced by lorns (E. S. R., 20, p. 444), a change in sex does 

 not appear in any way to be connected with the removal or retention of the 

 terminal bud. 



Tea culture on the east coast of Sumatra, C. Beknabd {Dept. Landb., Nijv. 

 en Handel [Dutch East Indies], Meded. Proefstat. Thee, No. 41 {1915), pp. 58, 

 pis. 14, figs. 5). — An account of the tea industry on the east coast of Sumatra, 

 with reference to its extent, cultural practices, methods of harvesting and 

 preparing the tea, and cost of growing and marketing. 



A walnut containing a hazelnut kernel, L. Daniel {Rev. Gen. Bot., 28 

 {1916), No. 325, pp. II-I4, figs. 12). — The author here describes a case of xenia 

 in which a walnut gathered from a tree adjacent to a hazelnut tree was 

 found to contain a kernel similar to the hazelnut. The seedling from this 

 kernel showed walnut leaves. 



Bay oil and the cultivation of the bay tree as a crop plant, H. A. Tempany 

 and W. RoBsoN {West Indian Bui., 15 {1915), No. 3, pp. 176-197, pi. Jf).— In 

 this paper the author briefly reviews the literature relative to the bay oil 

 and bay rum industries, summarizes the existing information in respect to 

 the culture of bay trees, and gives the principal results of experiments con- 

 ducted at the Montserrat Station for a number of years in the culture of 

 bay trees and the distillation of bay oil. 



The possibility and value of improving the commercial belladonna crop 

 through selection, A. F. Sievers {Amer. Jour. Pharm., 88 {1916), No. 5, pp. 

 193-215). — This paper is based upon and presents the more important results 

 of the author's selection and breeding experiments with special reference 

 to increasing the alkaloidal content of belladonna plants (E. S. R., 34, p. 237). 



Henna, F. Coetesi and G. Tommasi {Ann. Bot. [Rome], 14 {1916), No. 1, pp. 

 1-27, figs. 6). — A botanical and chemical investigation of the henna plant 

 {Lawsonia alba) is reported. 



Report of the committee on plants, C. W. Eichling, J. Rinck, and J. G. 

 Thoma {Proc. Ann. Conv. Ry. Gard. Assoc, 9 {1915), pp. 24-32). — A descriptive 



