ABSTRACTS. 



975 



Tritomas. By S. Mottet {Rev. Hort. pp. 577-580 ; 12 1901). With 

 six illustrations of various species and descriptions of varieties. — C. T. D, 



Tulips, Rembrandt. By Jules Rudolph (Rev. Hort, pp. 481, 482 ; 

 10/1901). — A striped-Howered section raised from the 'Darwin,' by MM. 

 Krelage & Son, Haarlem. More robust, nearly 2 feet high, late flowering 

 and permanent. — C. T. D. 



Ule's Expedition to the Caoutchouc Reg-ion of the Amazon 

 River {Not. Konig. Bot. Berlin, 22, p. 129, Oct. 1901).— Notes on Hevea 

 brasilieiisis and other species of Hevea, Sapium, Castilloa, and rubber- 

 yielding trees. — H. J/. TP^ 



Valerianacese and Dipsaceae, The Relationships of. By F. 



Hock {Engl. Bot. Jalirh. xxxi. pp. 405-411; 10/12/1901).— A brief 

 criticism of the subdivision and mutual affinities of the two orders, arising 

 from a consideration of the closely allied genera Hoeckia and Triplostcgicij 

 which are to be regarded as forming a tribe of Valerianacece, but represent- 

 ing a connecting link with the Dipsacece, for which the name Scabiosacece 

 is suggested as more suitable. — A. B. R. 



Vanda coerulescens, Griff. (Cogniaux in Diet. Icon. Orcli., 

 Vanda, pi. 13; 5 1901). — Discovered in Burma by Griffith in 1837, and 

 introduced by Colonel Benson in 1867. Sepals and petals lilac-blue ; lip 

 violet ; flowers small. — C. C. H. 



Vanda x * Miss Joachim,' Ridley (Cogniaux in Diet. Icon. Orch., 

 Vanda hyb., pi. 1; 11/1901). — A hybrid obtained by Miss Joachim at 

 Singapore in 1893, out of V. teres by V. Hookeriana. Sepals and petals 

 rose, lateral sepals paler or white ; lip purple-rose shaded violet, with 

 yellow base. — C. C. H. 



Variation and Environment. By C. T. Druery {Gard. Chron. 

 No. 781, p. 433, December 14, 1901). — Various theories as to the influence 

 of environment on variation are discussed and commented on. — G. S. S. 



Variegation, Numerous associated Instances {Rev. Hort. 

 p. 443; 10/1901). — The Directors of La Carrosaccia, at Ajaccio, Corsica, 

 report the appearance among their cultures of a striated Adiantum 

 cuneatum, a Kentia Forstcriana with one striated leaf, a striated Begonia 

 semperflorens Vernon, leaves occasionally all white, and five plants of 

 Wistaria sinensis, in one sowing, all with yellowish white leaves, which, 

 however, become green later as the plants mature. The silico-schistose 

 nature of the soil is suggested as cause, but the late Mr. G. B. Wollaston 

 was a strong believer in variegation being contagious by root anastomosis, 

 and has shown me associated plants of difterent genera, which he declared 

 had so originated. — C. T. D. 



Varieties, New, The Art of obtaining*. By Viviaud Morel {Rev. 

 Hort. p. 563 ; 12/1901).— A practical work in this direction.— C. T, D, 



