No. 1, July, 1920] HORTICULTURE 133 



results of previous selections and show that the difference between high and low is in large 

 part, if not wholly, due to accessory factors outside of the sex chromosome in which the bar 

 gene is located. There is no evidence that variability of the bar gene is a factor in this effect, 

 which is purely a matter of the sorting of differences existing in the stock at the beginning of 

 selection. There is, however, no limit to the possibilities of selection if the occasional mutants 

 are included in the series, and two at least of these, reversal to full and ultrabar, have been 

 shown to changes in the bar gene itself. — Charles Zelenij. 



831. Zinn, Jacob. On variation in Tartary buckwheat, Fagopyrum tataricum (L.) 

 Gaertn. Proc. Nation. Acad. Sci. U. S. Amer. 5: 506-514. Nov., 1919. — Normally 50 per cent 

 or more of this race have 3 carpels. Unusual conditions (high humidity and temperature) 

 shift the mode (67 per cent) to 4 (abnormal), range 3 to 25. Abnormal perigones, up to 18 

 parts, are distinctly correlated with above. Race comes from single abnormal individual, 

 and behaves in inheritance as eversporting variety, selection of abnormal extremes being 

 ineffective. Abnormalities are most frequently at certain nodes. Full account to be pub- 

 lished in Genetics. — Merle C. Coulter. 



HORTICULTURE 



J. H. Gourley, Editor 



FLORICULTURE AND ORNAMENTAL HORTICULTURE 



832. Ahmed Bin Haji Omar. Races of the coconut palm. Gardens' Bull. Straits Settle- 

 ments 2: 143. S pi. 1919. — Fourteen varieties of Singapore coconuts are briefly character- 

 ized; photographic plates show the end view, side view, and cross section of the nut of each. 

 —5. F. T release. 



833. Anonymous. A new and promising rose. [Rev. of: Van Fleet, Dr. W. New pillar 

 rose. Jour. Heredity 10: 136-138. 2 fig. 1919.] Florists' Exchange 47: 1161. 1919.— Par- 

 entage, description and habits given of a new rose seedling which gives much promise among 

 the hardy pillar or low climbing sorts. He includes among its ancestors the new Chinese 

 Rosa Soulieana, R. setigera, R. Wichuraiana and a Tea Rose. — L. A. Minns. 



834. Anonymous. A substitute for glass. Nation. Nurseryman 27:315. 1919. — A sub- 

 stitute for glass to be used in greenhouse work is reported to be on the market in England. 

 It is composed of water and white gelatinous substance worked on to a pliable but strong 

 foundation of fine wire or fabric netting. The weight is only a fraction of that of glass and 

 breakage is reduced to almost nothing. Transmission of light is only slightly less than with 

 glass and it promises to be an economical substitute for the latter. — /. H. Gourley. 



835. Anonymous. Celastrus obiculatus. Nation. Nurseryman 27: 289. 1919. 1 fig. — 

 The Japanese bittersweet (Celastrus obiculatus) can be trained into ''standard' form and is 

 recommended for garden planting as more showy than our native species. — W. N. Clute. 



836. Anonymous. Chionanthus Virginica. Nation. Nurseryman 27: 185, 1S6. 1 fig. 

 1919. — The staminate form of the fringe tree (Chionanthus Virginica) is the showiest, but 

 the blue-black fruit of the pistillate plant is an added decorative feature and the fruit is 

 much relished by birds. The species is hardy as far north as Massachusetts and Northern 

 Illinois but may be injured in severe winters. — W. N. Clute. 



837. Anonymous. Halesia tetraptera, var. monticola. Nation. Nurseryman 27:292. 

 1919. — The form of Halesia tetraptera growing in elevated parts of the Southern States has 

 been distinguished from the lowland form as var. monticola. The leaves are less hairy, the 

 flowers a third larger and the fruit twice as large. The variety grows in tree form often SO 

 feet high and is recommended for street planting. — W. N. Clute. 



