236 EXPERIMENT STATION RECORD. 



Second report on cacao selection at Getas, A. H. Meyee and C. J. J. Van 

 Hall {Meded. Proeffitat. Midden-Java, No. 11 {1914), pp. 15, figs. 2). — A similar 

 progress report on tliat part of the above noted cacao selection studies that is 

 being conducted at Getas, Java. 



A study of the factors influencing seed formation in citrus fruits, J. E. 

 CoiT {California Sta. Rpt. lOVf, PP- 105, 106). — This comprises a brief sum- 

 mary of the results thus far secured in this investigation. 



The results indicate that cross pollination is unnecessary in all naturally 

 fertile varieties of orange trees and that pollination takes place without the 

 activity of insects. Viable pollen of parthenocarpic varieties is either entirely 

 wanting or is very scarce. Consequently these varieties bear fruit without 

 pollination. "The time i-equired for complete fertilization after pollination 

 varies with the variety, from 30 hours in the Satsuma orange to four weelis 

 in the trifoliate orange. Disintegration of the embryo sacs sometimes takes 

 place in the Washington navel and Satsuma oranges. It may occur before the 

 formation of the megaspores, but usually not until afterwards. Some normal 

 embryo sacs are produced in occasional fruits of both Washington navel and 

 Satsuma oranges. Thus a few seeds may be produced, provided these par- 

 ticular fruits happen to be pollinated with viable pollen from fertile varieties. 

 It is the remoteness of the chance of this occurring under ordinary field con- 

 ditions that accounts for the seedlessness of these fruits. There appears to 

 be nothing in the structure of the flowers of either the Washington navel or 

 the Satsuma oranges which would interfere in any way with the germination 

 of pollen or normal extension of the pollen tube. Parthenocarpic citrus varie- 

 ties are probably hybrids between naturally fertile varieties." 



The present condition of citrus growing in Spain, J. M. Priego {Internat. 

 Inst. Agr. [Rome], Mo. Bui. Agr. Intel, and Plant Diseases, 4 {1913), No. 2, pp. 

 161-166). — ^A short general and statistical account of the citrus industry in 

 Spain. 



The coconut, Octave J. A. Collet {La Noix de Coco. Paris and Brussels, 

 1913, pp. 176, figs. 33). — A treatise on the coconut with reference to its botany, 

 plantation culture and management, and the preparation of copra, coconut oil, 

 and other products. The subject matter is based primarily upon a study of the 

 industry as conducted in various tropical countries. 



Manurial experiments on coconuts, 1913—14, J. de Verteuil {Bui. Dept. 

 Agr. Trinidad and Tolago, 13 {1914), No. 83, pp. 267-276, pi. 1).— This report 

 deals with the third year's results of manurial experiments on coconuts being 

 conducted under the direction of the Trinidad Board of Agriculture (E. S. R., 

 30, p. 644). 



Although no conclusions are drawn from the work as yet, the results for the 

 third season failed to show any decided gains by the use of commercial fer- 

 tilizers. 



Second report on selection tests of Robusta coffee, O. Vot^XE and C. J. J. 

 Van Hall {Meded. Procfstat. Midden-Java, No. 15 {1914). PP- 16. figs. 6).— 

 A progress report on breeding and selection experiments with Robusta coffee in 

 Java (E. S. R., 30, p. 43). 



Some aspects of modern tea pruning, G. D. Hope and P. H. Carpenter 

 {Calcutta: Indian Tea Assoc., 1914, PP- 57+IV, pis. 12). — ^A discussion of the 

 principles and practice of pruning, with special reference to the tea plant. 



Report on the botanic gardens and their work, J. F. Waby {Rpt. Dept. 

 Sci. and Agr. Brit. Gitiana, 1912-13, App. 2. pp. 19). — A report on the botanic 

 gardens of British Guiana for the year 1912-13, including notes on the character 

 and condition of ornamentals and economic plants being tested. 



