268 HORTICULTURE [Box. Absts., Vol. VII, 



1853. WoLTBRECK, RiCH. Variation und Artbildung. Analytische und experimentelle 

 Untersuchungen an pelagischen Daphniden und anderen Cladoceren. Erster Teil: Morpho- 

 logische, entwicltlungsgeschichtliche und physiologische Variations-Analyse. [Variation and 

 species formation. Analytical and experimental studies on pelagic Daphnias and other Clado- 

 cera. Part I. Analysis of morphological, embryological, and physiological variation.] 145 p., 

 6 pi, 55 fig. Bern, 1919.— See Bot. Absts. 7, Entry 1791. 



1854. Zaleski, Leopold. Wkwestyi metod analityernych w selekcjii burakow paste- 

 wnych. [Contribution to the analytical method in fodder-beet breeding.] Ziemianin Posen, 

 1920.— See Bot. Absts. 7, Entry 1717. 



HORTICULTURE 



J. H. GouRLEY, Editor 

 H. E. Knowlton, Assistant Editor 



FLORICULTURE AND ORNAMENTAL HORTICULTURE 



1855. Albert, C. Questions potageres d'actualite. [Gardening questions appropriate to 

 the season.] Eev. Hort. 92: 143-144. 1920. 



1856. Allwood, Montague C. Carnations — their pests and diseases. Jour. Roy. 

 Hort. Soc. 45 : 233-235. Fig. 35-38. 1919. — The two main factors in having healthy carnations 

 are initial clean stock and a correct fertilizer; the latter should be a slow acting organic food. 

 An excess of nitrogen is detrimental. Stem rot is perhaps the most common disease; it can 

 be prevented, but not cured, by proper soil conditions. Bacteriosis or stigmonose may be 

 prevented by propagating from vigorous, healthy plants. Red spider (Tetranyclus telarius) 

 may be controlled by daily syringing and by the use every fourteen days of specially pre- 

 pared nicotine extract. Split calyx is caused by irregular soil or climatic conditions, or by 

 the use of unsuitable fertilizers. Various soil pests are controlled by steam sterilization or 

 by allowing chickens access to the soil before it is brought into the greenhouse. — J. K. Shaw. 



1857. Anonymous. Articles of agreement between the American Iris Society and the 

 Brooklyn Botanic Garden. Brooklyn Bot. Gard. Rec. 9: 119-121. 1920.— "The essence of this 

 agreement is the development, maintenance, and study of a beautiful, complete, and valu- 

 able collection of Japanese irises, and the utilization of it in such a manner as to promote the 

 aims and objects of the Society and the Garden jointly." — C. S. Gager. 



1858. Barron, Leonard. The feast of the dahlias. Gard. Mag. 32': 128-131. 9 fig. 

 1920. — A discussion regarding exhibits of the American Dahlia Society. — H. C. Thompson. 



1859. Barron, Leonard. Our own evergreen garden. Gard. Mag. 32': 133-134. 1 fig. 

 1920. — Uses of evergreens in decorative planting, with a large list of coniferous and broad- 

 leaved species. — H. C. Thompson. 



1860. Bixby, W. G. Cordifonnis-sieboldiana. Amer. Nut. Jour. 11 : 56. 1919. — Juglans 

 cordiformis is not a species distinct from Juglans sieboldiana. E. H. Wilson of the Arnold 

 Arboretum confirms this statement. — -E. L. Overholser. 



1861. Boyer, Jacques. Artificial fertilization of flowers. Sci. Amer. 122:651. 3 fig. 

 1920. 



1862. Chasset, L. Dans les petits jardins: le gobelet nain. [The dwarf goblet in small 

 gardens.] Rev. Hort. 92 : 183-184. Fig. 64- 1920. — Specific directions for the complete devel- 

 opment of the goblet form of dwarf tree from the single-stem graft of one year of age are given, 

 since well formed trees are generally not available from the nurseries. This form possesses 

 the following advantages : All the main branches are of equal height ; the tree and fruits receive 



