ALGUES VERTES DE LA SUISSE 267 
simpler facts of the morphology and physiology of seed-plants, 
and is certainly not a bad pennyworth. BR 
Algues Vertes de la Suisse. Pleurococeoides-Chroolépoides. 
Par R. Cuopar. 
Turis volume forms the third fascicle of the first volume of 
Matériaux pour la Flore Cryptogamique Suisse, published on the 
a 
from personal experience and from the works of others, especially 
as regards the development of the individual plants. g con- 
vinced of the necessity for studying the polymorphism of species of 
fresh-water alge in order to arrive at a true definition of the 
species limits, he has devoted much time and attention to the bio- 
logical side of the subject. His notes are therefore of great interest 
and value, 
- In the Introduction the author tells us he wished at first to 
include all the families of the green alge, but as this was 
are 
quently been able to study them in detail. But he points ont that 
€ven in the cases where only Swiss specimens have been studied, 
the facts would hold good for such species all over the world; and 
since the fresh-water flora of Switzerland is not very different from 
that in any other part of the world, ‘a treatise on Swiss alge 1s 
useful both in Japan and Paraguay.” : 
M. Chodat divides his book into four parts :—4. Collection and 
Preservation of fresh-water alge. B. Morphology, in which he 
treats, under separate headings, of Protoplasm, Vacuoles, Flagella, 
Stigma, Chromatophore, Pyrenoid, Nucleus, Membrane, Pluri- 
cellular Thallus, Hairs and Bristles, Rhizoids, and Organs of Attach- 
ment, Organs of Multiplication. C. Biology, under the headings 
phils, Plankton, Cryoplankton, Dispersal. D. Classification. Lists 
of bibliogra hy are given. Under this last division he treats the 
rococcoidee with Schizogonioidee and the Chroolepotdee. This 
ccupies 246 pages of the book, and is a most valuable contribution 
