NOTES AND ABSTEACTS. 



659 



Retting is dealt with, and also breaking, the latter being the process 

 by which the fibre is separated from the stalk and roughly cleaned. 



The subject of marketing is fully dealt with, and tables are given 

 showing the production in Kentucky, prices, &e. — V. J. M. 



Hexadesmia crurigera (Ovch. Bev. Nov. 1903, p. 329, fig. 49).— 

 Historical particulars accompany the illustration, taken from a plant 

 while in flower in the Botanic Gardens, Glasnevin. — H. J. C. 



Hippeastrum vittatum (L.), Twin flower of. By P. Magnus 

 (Gartenflora, 1/7/03, p. 345; figs. 49-51). — The twin flower had ten 

 petals, ten stamens, and united double stigma. — J. P. 



Hoar-frost, [Fertilisation by. By P. Hariot (Le Jard. March 20, 

 1903, p. 153). — It is stated that hoar-frost contains extra nitrogen, which 

 it filters from the atmosphere, and so becomes a fertilising factor. 



C. W. D. 



Huernia COncinna. By Sir J. D. Hooker (Bot. Mag. tab. 7905). — 

 Nat. ord. Asclepiadacece, tribe Stapeliecz. Native of Somaliland. The 

 stems are clustered, 1-2^ inches long, 5-angled, and spiny. The corolla 

 is broadly campanulate, about 1 inch across, yellowish-white, covered 

 with bristle-like appendages on upper surface, pale yellow dotted with 

 brown. — G. H. 



Humea elegans {Journ. Hort. December 29, 1903, p. 582).— It has 

 been noticed that the gum- scented effluvium from this plant poisons 

 plants near it, causing, for instance, Peach trees to lose their young- 

 leaves.— C. W.\D. 



Hybridisation, International Conference on Plant Breeding- 



and (Bull. Dep. Agr. Jam. vol. i., pt. 3, p. 56). — Eeviews of papers by 

 Professor W. Bateson, C. C. Hurst, Hugo de Vries, and American 

 botanists, as well as by Sir Daniel Morris on the Cross Fertilisation of 

 the Sugar-cane in the West Indies. The whole constitutes a valuable 

 contribution to the literature of hybridisation. — G. H. 



Hydrangeas (Gard. Mag. No. 2600, p. 577 ; 29/8/03).— An 

 excellent account of the Hydrangeas in cultivation, with a brief 

 descriptive note on each, with hints upon their cultivation. Illustrations 

 of H. Hortensia and its beautiful variety Mariesi are given. — W. G. 



Hydrangeas, Standard. By E. Piedoye (Bev. Hort. August 1, 1903, 

 pp. 362-3 ; 3 woodcuts). — Description of method of forming compact-headed 

 standards by choosing strongest roots, suppressing all others, and subse- 

 quently pinching out the top so as to form a standard bush. — C. T. D. 



Hypericum (Journ. Hort. September 3, 1903, p. 215).— A useful 

 compendium, with brief description of the hardy shrubs of this genus, 

 cultivated at Kew. — C. W. D. 



Hypsophila Dielsiana Loesener (Not. Konig. Bot. Berlin, Bd. IV., 

 p. 62, July 10, 1903). — A technical description of this member of the 

 Celastracece, from Queensland. — H. M. W. 



