376 THE JOURNAL OF BOTANY 



of axillary shoot. The Shore specimen has thrown new hght on 

 the derivation of the peripheral loops, the distribution of the 

 protoxylem, and the course of the strands supplying the aphlebise. 

 Zygopteris, or, as we may now call it, Ankyrojyteris Grayi, is a 

 highly developed member of the Primofilices, and presents inter- 

 esting analogies with the curious genus Asterochlcsna, recently 

 described in full detail by Paul Bertrand. The relation to the 

 stem of Diplolahis Boemeri, discovered by W. T. Gordon, is also 

 of much interest, but seems to be collateral rather than direct. 



At the same meeting Mr. Alfred O. Walker read a paper on 

 the distribution of Elodea canadensis Michx. in the British Isles in 

 1909. He stated that Elodea canadensis Michx. is said to have 

 been first seen in Ireland in 1836 and in Berwickshire in 1845. 

 By 1850 it had become so abundant in many parts of the British 

 Isles as to be a serious nuisance by choking up canals, water- 

 courses, and drains, and all attempts to clear it out failed. It was 

 found, however, that after a few years it died out or became com- 

 paratively scarce and feeble. Information on the subject is given 

 in the paper from twenty-four counties in England and Wales, six 

 in Scotland, and three in Ireland, showing on the whole that the 

 plant has decreased of late. 



The California Academy of Sciences has published (Jan. 20, 

 1911), in its report of the expedition to the Galapagos Islands in 

 1905-6, a botanical survey of the islands by Mr. Alban Stewart, 

 botanist to the expedition. This forms a quarto volume of 252 

 pages, with a map and 18 plates, in which the novelties and more 

 interesting plants are figured. The novelties include, besides 

 forms of known species, new species of Brachistus, Cissampelos, 

 Euphorbia (two), Opuntia, Beperania (two), Scalesia (two), and 

 Telanthera. The nomenclature is in accordance with the Rules of 

 the Vienna Congress. 



We are glad to see that the new edition of Mr. J. W. White's 

 Flora of the British Coalfields is announced for early publication. 

 The work has been entirely rewritten and will now be entitled 

 The Flora of Bristol. It will form a volume of abouj} 700 pages, 

 with three plates and a map, and will be issued to subscribers at 

 10s. net ; names should be sent to the author, 18 Woodland Road, 

 Clifton, Bristol. 



The third number of the Journal of Genetics, dated Sept. 8 

 but only recently to hand, is as usual beautifully printed and its 

 plates, especially those in colour, are of a high order of execution. 

 The botanical article (of seventy pages) in the present issue is 

 "Studies in Indian Cotton," by H. M. Leake, narrating a series of 

 experiments regarding the colour of the corolla, the red colouring 

 matter of the sap, the leaf factor, the type of branching and the 

 length of the vegetative period, and the leaf glands ; tliis is illus- 

 trated by numerous tables and two plates (one coloured). 



We regret that, owing to pressure on our space, several com- 

 munications and review's are unavoidably delayed. 



