124 HORTICULTURE [Box. Absts., Vol. IX, 



776. Westerbeek vanEerten, J. B. [Dutch rev. of: Westerbeek van Eerten, J. B. 

 arts te Hummelo. Eugenetiek, historischcritisch over-zicht. (Eugenics, a historical critical 

 review.) S07 p. A. A. von Deutekom: Utrecht, 1920.] Genetica 3 : 81-88. 1921. 



777. Wettstein, F. von. Kiinstliche haploide Parthenogenese bei Vaucheria und die 

 geschlechtliche Tendenz ihrer Keimzellen. [Artificial haploid parthenogenesis in Vaucheria 

 and the sexual tendency of its germ cells.) Ber. Deutsch. Bot. Ges. 38: 260-266. Fig. 1-S. 

 1920. — Antheridia were removed at a very early stage of development; later, when the oogon- 

 ivmi had reached its full size and was cut off by a partition wall, but before opening, it was 

 pricked with a fine needle or with a thin, sharp glass capillary tube. To prevent the oozing 

 out of the cell contents, each operation was performed in a plasmolyzing solution (3 per cent 

 KNO3) ; after about 2 minutes the plant was returned to the normal nutrient solution. Of 

 numerous oogonia of Vaucheria hamata (Vauch.) DC. thus treated, 3 grew out into filaments; 

 1 of these filaments died while still short; the other 2 were separated from the parent plant, 

 and each deve' oped into a plant of typical form which, like the mother plant, bore both an- 

 theridia and oogonia. — Of a considerable number of antheridia similarly wounded, 2 developed 

 into filaments, 1 of which survived to become likewise a typical monoecious plant. — Of V . 

 sessilis (Vauch.) DC., 1 oogonium was induced to regenerate, with similar results. — These 

 experiments are considered as supporting the notion of Correns that both sexual potentiali- 

 ties are present in the cells of both monoecious and dioecious plants, whether haploid or dip- 

 loid, and that the development of either sex organ results from the action of factors which 

 inhibit the expression of the opposite potentiality, either in the plant as a whole (dioecism) 

 or in a particular part of the plant (monoecism). In the present case, the regenerating organs 

 contained only the sexual nuclei, which in each case, therefore, must carry both sexual poten- 

 tialities. — C. E. Allen. 



778. WiTscHi. [German rev. of: Lebedinsky, N. G. Darwins geschlechtliche Zucht- 

 wahl und ihre arterhaltende Bedeutung. (Darwin's sexual selection and its significance 

 for the maintenance of species.) Habilitationsvortrag Univ. Basel. 31 -p. Helbing Lich- 

 tenhahn: Basel, 1918. Idem. Geschlechtsdimorphismus und Sexualselektion. (Sex dimor- 

 phism and sexual selection.) Verh. Naturf. Ges. Basel 30: 1919.] Biol. Zentralbl. 40: 571-573. 

 1920. 



HORTICULTURE 



J. H. GouRLEY, Editor 

 H. E. Knowlton, Assistant Editor 



(See also in this issue Entries 590, 604, 606, 625, 662, 666, 667, 729, 898, 910, 932, 948, 954, 



960, 1020, 1038, 1070, 1093, 1094) 



FRUITS AND GENERAL HORTICULTURE 



779. Anonymous. Culturas intercalares entre os coqueiros. [Crops for interplanting 

 between coconuts.] Bol. Agric. [Nova Goa, Portuguese East India] 1 : 210-212. 1919. — Minor 

 crops are listed which can be cultivated between the rows in coconut plantations, including 

 those that may be grown during the first 5 years before the coconuts are in bearing and those 

 that may be grown after that time. Sweet potatoes, coffee, millet, bananas, cassava, tomatoes, 

 peppers, eggplants, and other vegetables are recommended. Various leguminous cover 

 crops will also prove beneficial. — John A. Stevenson. 



780. Anonymous. Posifac do coco-semente no solo. [Position of the seed coconut in 

 the ground.] Bol. Agric. [Nova Goa, Portuguese East India] 1:212-214. 1919. — An experi- 

 ment was carried out to ascertain the proper position for planting coconuts. One lot was 

 placed vertically with the germ end up, a 2nd lot in the reverse position, a 3rd lot horizontal with 

 the germ end slightly depressed, a 4th lot horizontal, and a 5th lot the reverse of the 3rd. 

 It was found that coconuts in the 3rd and 4th positions germinated best. — John A. Stevenson. 



