186 THE JOURNAL OF BOTANY 
from the sentence we have quoted. It may be claimed on 
behalf of the author that his aim is to appeal to the general 
reader rather than to the working roan val Yet, although 
do 
vague, the volume which publishes them a not fulfil the 
conditions required of a.work of science. F. K. 
The Potamogetons (Pond Weeds) of the British Isles, with Descrip- 
tions of all the Species, Varieties, ged Hybrids. By ALFRED 
Fryer, A.L.S., and ArTHU ag ir Tt, A.L.S. (The Lucens 
Group et from Mr. Fryer’s Pieces Notes by A. H. 
Evans, F.Z.8.) Titagiaiat "by Robert Morgan, F.L.S., and 
others. London: L. Reeve & Co. 1915. Quarto, pp. x, 94; 
60 plates. Price £5 5s., coloured; £3 15s., uncoloured. 
THE completion of this fine — (the ees important and 
profusely illustrated complete monograph o y large critical 
genus of our country hitherto published) will ae ee welcome to 
those who can afford its cost. The co-operation of Messrs. 
Bennett and Fryer, whose combin WwW s unrivalled 
original author nor the artist lived to complete their task, thou 
Mr. Evans was able to compile the section ale ng with the Lucens 
group from Fryer’s notes and persona AT pier so as to 
represent his final ideas; and little or nothing has been lost 
through Mr. Bennett's having to undertake the mcr 
n 
Sev n years he ve ea since Mr. Britten wrote a notice 
of the rs part issued Goum. Bot. 1898, 354) ; and his criticism 
is very just. @ one serious drawback to which attention was 
given as an appendix, in accordance with his Senet 
(in the text) of P. penns hoa naturalized in nal n 
; “I believe this to y instance of the introduc- 
— ofa ee e ses Ds) ein _— cases more than one 
fi 
a species is given; for instance, we have three 
iaicnnaladicis of P pee a “ts fruit i is mounared on tab. 26 
(P. prelongus 
“Mr. Bennett has written a four-page introduction, dealing 
mainly with the genusasa whole. He mentions that Dr. Graebner, 
