222 Floristik etc. — Angewandte Botanik. 



Stevens, G. T., An illustrated guide to the flowering plants 

 of the Middle Atlantic and New England States (excep- 

 ting the grasses and sedges. (New York, Dodd, Mead and 

 Company. 1910. 8". p. 749. pl. 200. textfig. 377, comprising 1500 ill.) 



An outline of structural botany, (54 pages), followed by an ana- 

 lysis of the Orders — in the Englerian sequence (10 pages), an 

 artificial key to the Families (14 pages), and a manual of the fiora. 

 The whole is cast in simple language, the illustrations, simplified 

 when feasible, are all original; and the author's purpose to render 

 the work available to non-technical students while conformed to 

 the requirements of the technical botanist, seems to have been 

 realized. Trelease. 



T. G. B., The Arolla Pine. (Nature N«. 2101. p. 399-400. 1910.) 



A review of Rikli's memoir "Die Arve in der Schweiz". (Bot. 

 Centn 111. p. 554—560). W. G. Smith. 



Yapp, R. H., Some Observation s on Spiraea Ulmaria. (Rep. 

 brit. Ass. Sc. Winnipeg, Sect. K. p. 673. 1909.) 



In a previous communication (Bot. Cent, 108. p. 599) sea.sonal 

 differences were described. "Further observations have shown that 

 in the case of rhizomes which do not develope into erect flowering 

 shoots, increasing hairiness is only found up to Jul3^ and after this 

 the leaves unfolded exhibit decreasing hairiness and become glabrous 

 in autumn. The production, in nature, of glabrous or hairy leaves 

 coincides with changes in the evaporating power of the air and in 

 light intensity. It is difficult to influence the hairiness of Spiraea 

 leaves by altering external conditions, but it is distinctly reduced 

 by growing the plant in deep shade, if at the same time the atmo- 

 sphere is constantly kept humid". W. G. Smith. 



Biffen, R. H., The Breeding of Wheat. (Rep. brit. Ass. Adv. 



Sc. Winnipeg. p. 760—764. 1909.) 

 Saunders, C. E., Wheat Breeding in Canada. (Ibid. p. 764 — 769.) 

 Zavitz, C. A., The Influence of Good Seed in Wheat Pro- 

 duction. (Ibid. p. 769—773.) 

 Klinek, L. .^•., Individuality in Plants. (Ibid. p. 773—775.) 

 Stapf, O., The History of the Wheats. (Ibid. p. 799-807.) 



During the meeting of the British Association at Winnipeg 

 a Joint meeting of the sections of Chemistry, Botany and Agriculture 

 was held for the purpose of discussing various problems connected 

 with the growing of the Wheat. The twelve papers presented at 

 this meeting are published as an appendix to the Report of the 

 Meeting, and together provide much Information bearing upon 

 scientific and economic aspects of the problems connected with the 

 supply of Wheat. The papers which have a more distinctly botanical 

 interest are enumerated above. 



Professor Biffen gave some account of the experimental bree- 

 ding which he and his pupils have carried on at Cambridge, 

 showing how, by tracing the mode of inheritance of the various 

 characters which are combined in the existent varieties, it has been 

 possible to put wheat-breeding upon a sure basis. He further dealt 

 with the experiments still in progress which have for their object 



