62 
there also exists a variety fluitans of C. dendroides, which also 
grows floating on the edges of ponds and lakes, while the nor- 
mal form of both species may be found higher up on the dry 
banks. E. G. Britton. 
Elements of Plant Anatomy. By Emily L. Gregory, Ph. D. 
Ginn & Co., Boston. 
The present small volume of 150 pages is a welcome addition 
to the few works which deal exclusively with plant anatomy. The 
author’s preface defines the scope of the work, and if it is taken 
within the definition of its writer we consider it a very excellent 
guide to the study of plant anatomy for beginners, especially if it 
is accompanied by class-room work. | 
‘The book begins with a general description of the morphology 
of the plant cell, and is followed by a study of the cell-wall, in 
which the morphology and the chemical modifications are de- 
scribed. This second chapter is, we think, a very excellent one. 
In chapter 3, upon cell-contents, the general chemical features of 
the cytoplasm and the nucleoplasm, in view of the vast amount of 
recent cytological work, might have been more definite and ex- 
tended ; especially could this be said of the process of karyokinesis, 
Chapter 4, upon the tissues, is brief and might have been better 
illustrated. It deals with the general anatomy of the tissues and 
serves as an introduction to chapter 5, which treats of the ana- 
tomical features of the Algae, Fungi, Lichens and Thallose 
Hepaticae; and to chapter 6, which deals with the details of the 
anatomy of the Cormophytes, the Mosses, Ferns, Monocotyledons 
and Dicotyledons. Chapter 7 describes the secondary growth of 
the stems of Dicotyledons and Gymnosperms, and is an excellent 
condensed account of this somewhat complicated process. 
The book is one that is especially intended as a class-room 
work to follow a given line of lectures, and as such the fewness of 
the illustrations may not be said to constitute a fault, but a few 
more would certainly add to its value. There isa lack of biblio- 
graphical references which we think would serve as a direct stimu- 
lus to further work to a few students at least. The author is per- 
haps fuller on some controversial points still in dispute than one 
would expect in a work of this size, but this, when supplemented _ 
by oral teaching, could be put in proper correlation with the rest. _ 
