264 THE JOURNAL OF BOTANY 



have already appeared. Among these contents are new plants 

 indicated as "new species," which of course really date from 

 1912. The part includes a number of useful " short notes" which 

 seem hardly in place in the "Transactions" of the Society. In 

 the interest of bibliographers as well as of botanists we would 

 venture to suggest that a note explanatory of the circumstances 

 indicated above should be prefixed to the volume when it is 

 completed. 



A second edition of Mr. Druce's Flora of Oxfordshire is 

 announced for publication by the Clarendon Press. The book has 

 been entirely re-written, and it is intended to make it not only a 

 catalogue of the county species, with their localities, but also a 

 history of them, and of the botanists connected with the University 

 and county. Mr. Druce also announces as in preparation The 

 Flora of Buckinghamshire. This will be on the same lines as 

 the Floras of Oxfordshire and Berkshire, to which it will be a 

 companion volume, and with them will complete the Flora of the 

 Upper Thames province. 



The sixth volume of the Oxford translation of Aristotle 

 published by the Clarendon Press, which Mr. W. D. Eoss is 

 editing, has been completed by the part containing De Plantis, 

 which has been undertaken by Mr. E. S. Forster. The price of 

 the part is 5s. net. 



The Journal of Genetics for June (vol. iii. n. 1) contains a 

 " Preliminary Note on Heterostylism in Oxalis and Lythrum," 

 by N. Barlow, who deals with the heredity of the three forms in 

 trimorphic heterostyled plants. The results of the work of Darwin 

 and Hildebrand are stated to be of "no great help to us at 

 present," except with regard to the "self-fertilized Lythrum" of 

 Darwin. The present investigations are mainly based upon 

 Oxalis valdiviana. M. Philippe de Vilmorin writes " Sur une 

 race de ble nain inflexible." 



Mr. W. K. Maxon's Studies of Tropical American Ferns 

 No. 4 (Contrib. U. S. Nat. Herb. xvii. Washington: 1913. 

 Pp. 133-179. 10 plates and figs.) is a careful and thorough piece 

 of work which clears away much misunderstanding that attached 

 to the following groups: — Asplenium Trichomanes and its American 

 allies (nineteen species) ; the North American tree-ferns of the 

 genus Dicksonia (four species) ; the genus Odontosoria in a revised 

 and restricted sense (ten species) ; Bommeria and some related 

 genera. In these and in some notes on Lycopodium and Cyathea 

 he describes a total of sixteen new species. The keys, the cita- 

 tions of literature and exsiccatae, the distribution, critical notes, 

 and the painstaking treatment throughout, show Mr. Maxon's 

 work to be of the highest order. He appeals to pteridologists to 

 revise such genera as Adiantum, Pteris, Blechnum, certain groups 

 of Asplenium and Athyrium, Lindsaya, Polystichum and others ; 

 and to model their work upon Christensen's conscientious and 

 elaborate new monograph of Dryopteris. 



