ANATOMICAL POTAMOGETON-STUDIES 61 
same lines as previous editions, the present volume introduces some 
considerable alterations, mainly in the portion dealing with the 
special treatment of the seed- plants. The late Professor Schimper’s 
place has been taken by. Dr. George Karsten, and the change has 
given the opportunity for a revision and re-arrangement ‘of the 
subject-matter of this section, which now follows more closely ~ 
order of arrangement of Engler’s Syllabus. The Gymnosperm 
are wagiy ane more fully, and in the accounts of the families 
of the Angiosperms more space is devoted to the description of 
indivi apa plants which are of importance from an economic or 
medicinal apg aa The number of figures in this — has 
been increased, and it is now most profusely illustrated ; 
the coloured pictures occupy the whole or the greater shes of the 
page; they show also a marked improvement on some of those in 
formér editions, which were poor and inadequate. In fact, so 
copious and helpful towards the elucidation of the text are the 
figures, that we fear lest many students may consider it unnecessary 
e specimens for examination, or to make themselves 
the results of revision of, or addition to, the a. 
athe in other sections, we may note that in the ch 
Physiology, by Dr. Noll, the portion dealing with the suécinisichd 
tissues of the plan has been enlarged, and the increasing interest 
in the euckeguel aspect of plant-life finds expression in additional 
subject-ma atter, and some excellent figures borrowed mainly from 
Professor Schimper’s Pflanzen- geographic. The weakest part of the 
volume seems to be that we Boy lge, and especially the Chloro- 
phycea, which are e disposed of in eight pages, and on the same lines as 
in the original edition mrs the three orders, Protococcoidea, Confer- 
sites: acai Siphonee ; the treatment of the Fungi is more satisfac- 
tory, but in both these great groups it would be helpful ‘if more 
space were given to the discussion of general principles. Finally 
the volume is produced with that degree of excellence which we are 
wont to associate with the works issued by Messrs. Fischer of Jena. 
A. Bo R. 
Anatomical arp iio and Potamogeton fluitans, 
Raungizer. (Botanisk Tidsskrift, xxv. 8, pp. 253-280 *i908}). 
In this admirable paper (written in English) Mr. Raunkier, who 
has studied st anatomy of Potamogeton, shows that, by the struc- 
ture of the stems and leaves, many species can be separated, cheer 
better than of systematic or — aeationees: He poin 
out that this must be done with all the species before a mien 
behoves all who have it in their power to help him — either 
dried, in spirit, or rae specimens. He has examined, more or less, 
some fifty-three species, and gives foares of the axial ermine’, 
sections of leaves, etc., of several. Hon the present he. divides s these 
fifty-three species into seventeen groups 
typical species of the groups; but es points. out that this arrange : 
