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JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Hybrids, Maize, especially Xenia. By C. Con-ens (Bot. Zeit. 

 No. 1, pp. 10, 11 ; 1902. Review of monographs in Bibliotlwca 

 Botanica, published by Chr. Luerssen, Stuttgart, 1901, Part 53 ; 3 plates). 

 The reviewer points out that further experiments by the author demon- 

 strate that Mendel's law becomes extremely difficult to establish 

 generally, a practical infinity of exceptions occurring owing to patent and 

 latent varietal peculiarities and liability to vary anew. A difficulty is 

 also found in defining what is a character, and the author's opinion is 

 that it is as yet too early to accept the Mendellian law as a branch of 

 exact science. — C. T. D. 



Hybrids, Pea.— On the Mode and Period of Separation of 

 Characters in Hybrids of the Pea Family. By C. Correns (Bot. 

 Zeit. Nos. 5, 6, pp. 65-82 ; March 1902). — A comprehensive exposition 

 of the Mendellian theory of character separation, and discussion of 

 varying views of himself and Strasburger. — C. T. D. 



Hydrosimetes, The: An Apparatus for Supplying* Plants 

 with Water under Constant Pressure. By J. W. Moll (Flora, xc. 

 1902, pp. 334-342; 2 cuts). — The working of this apparatus can only 

 be understood by reference to illustrations ; its utility to the physiologist 

 is obvious. — M. H. 



Hypericophyllum : A Revision of the Genus, with Notes on 

 certain allied Genera of Composite. By N. E. Brown (Jour. 

 Linn. Soc. vol. xxxv. p. 120, with a figure of H. scabridum). — There 

 appears to have been much confusion with the species belonging to this 

 genus, and the identity of the genus itself, owing to the scarcity of 

 material. From careful examination of the specimens at Kew, the author 

 proposes to restore the four genera, Jaumca, Pers., Espejoa, DC, Chcety- 

 menia, Hook, and Am., and Hypericophyllum, which had for some time 

 been united with the genus Jaumea, Pers., to their former position, and 

 a key is given to their distinctive characters, and a brief description is 

 given of each of the five species of Hypericophyllum.— G. S. S. 



Impatiens grandiflora. By Sir. J. D. Hooker (Bot. Mag. tab. 

 782G). — Nat. ord. Gcraniacece, tribe Balsamincce. Native of Madagascar. 

 It is by far the largest-flowered Balsam discovered. It flowered at Kew 

 in 1900. The leaves are G inches long and bullate. The flowers from 

 2[, to 3 inches long, bright rose-red with crimson stripes. — G. H. 



Impatiens psittacina. By Sir J. D. Hooker (Bot. Mag. tab. 7809). 

 Nat. ord. Gcraniacece, tribe Balsaminece. Native of Burma. It is a 

 compact plant, growing to 2^ feet in height, very floriferous, the flowers, 

 I ilnc w ith a crimson spur, " resembling a cockatoo." It was raised from 

 seed and flowered at Kew in 1900. — G. H, 



Incarvillea Delavayi. By S. Arnott (Journ. Hort. p. 146 ; Feb. 13, 



1902). This is said to be quite hardy and perennial in Dumfries, and it 

 is very easily raised from seed, which it ripens plentifully. — C. W. D. 



