FLOlfA OF COUNTY KEKRV .59 



the authority of Professor Gliick ; he has referred to this a submerged 

 barren plant, gathered at Killarney by Mr. Druce, " whicli, to the 

 unaided eye, is quite indistinguishable from submerged growths of 

 Alisma ranunculoides.'" Scirpiis parvulvs is abundant at intervals 

 for a distance of about three miles on both sides of the tidal River 

 Cashen, near Ballybunion ; Arklow (Co. Wicklow) is the only 

 other known Irish habitat. " In the field Carex punctata may be 

 readily distinguislied from C distans by its spreading fruit, which is 

 a very constant character in the Kerry plant, the fruit of C. dista/ts 

 being always more or less ascending." C. aciifi/'orm/s {paliidosa 

 (lood.) has not been observed. Ayrostis canina var. lavis Hackel, 

 from near the sunnnit of Brandon, "differs fi'om the type in its larger 

 spikelets and broader leaves, and in its panicle branches and pedicels 

 being smooth instead of rough." Although Foa atpina was noted by 

 Mackay on the summit of Brandon as being " not at all viviparous," 

 it was exclusively so, in 1911, and maintains this condition in my 

 garden. Glyceria declinata, here treated as a dwarf variety of 

 G. jiuitaas, is much nearer to G. pJicata in floral characters, but 

 deserves specific rank, JBromus commutatus apparently possesses as 

 good claims to be considered native, in some meadows near Killarney, 

 as anywhere in southern England. Trichomaii.es radicans has a sad 

 history of wanton destruction. 



The writer of this by no means exhaustive notice is an old friend 

 of the author, and can recall many pleasant memories of botanical 

 rambles with him. Mr. Scully's book may be as strongly recommended 

 to English as to Irish readers : it is accurate, scholarly, interesting, 

 and suggestive throughout. 



EnwAKD S. Makshall. 



Evolution hy means of Hybridization. By J. P. Lotsy. 8vo, 

 pp. X, 166, 2 text-figs. M. Nijhoff : The Hague. 1916. Price 

 hs. net. 



We are grateful to Dr. Lotsy for wTiting his book in English, 

 more especially when we remember that he is equally competent to 

 WTite it in almost an}^ of the better-known European languages. 

 Apart from our recollection of a former remark of Dr. Lotsy 's that 

 English, if it w^ere not for the pronunciation, might be taken as the 

 universal language, we remember that it was at a meeting of our 

 Linnean Society a few^ years ago that Dr. Lotsy introduced the point 

 of view w^hich he has elaborated in the present volume — the view% 

 namely, that the origin of species is due solely to crossing. Probably 

 no one will agree entii-ely w^ith Dr. Lotsy, but everyone will admit 

 that he has given a remarkably clear and interesting statement of his 

 position. 



The author starts with a definition of terms. The '• Linnean 

 species," which he defines as the total of individuals which resemble 

 one another more than they do any other individuals, he terms a 

 Linneon. The so-called microspecies, Jordanian species or elementary 

 species which can be distinguished within many Linneons and which 

 remain constant when reproduced by seed, he terms Jordanons: But 

 even the test of faithful reproduction by seed is no proof of specific 



