132 THE JOURNAL OF BOTANY 
to them for cose ram shane of at once making a definite and 
critical examination of the living plants met aah in the course of 
fiel , H. rigidum of Hartman is described; this 
plant is, however, so obscurely and vaguely characterized by Hart- 
man (1820), that or aritical students of the genus have ig. eet 
ote is $ well aoegs on stout paper, and the text is free 
from i pographical erro Freperic N. Wituiams. 
[The citation of Fries as the lp erean for H. rigidum introduc 
a principle which would, we think, be fatal to anything like stability 
in nomenclature.—Ep. Journ. Bor ot. | 
Biochemie der Pflanzen. Von Friepricn Czarex, Professor der 
ik i Bd. I. 8vo, pp. xv, 584. Jena: Fischer 
1905. sie: 14M. 
Dr. Czarex’s book gives a detailed account of the chemistry of 
the various pane groups of substances which we associate with 
the building-up processes in plants. It is divided into three parts. 
rst, an historical introduction of twenty pages, —— the 
course of evolution of the study of plant-nutrition. The second, or 
general part, comprising about seventy pages, arte rate chapter 
The first, entitled ‘The Su batdatank of the Chemical Processes in 
the Living Organism,” discusses the composition said properties of 
ons in 
Living Plant-organisms,”’ treats of the chemical and physical pro- 
perties of ve cell, seven degy a sere nature, formation, rela- 
tion to external facto: In the second, or special portion, 
occupying the rest of the pai the aie gives a detailed treat- 
ment of the various substances formed in the process of assimila- 
reserves, and subsequent use &. A cha s also devoted to CO 
8 on and synthesis of sugar by the chlorophyll corpuscle 
(with a reference to chlorophyll-assimilati , c- 
chem of the corpuscle and its pigment are t 
exhaustively treated, _ ~ ser is e to the various other 
pigments which are with photo-synthesis, especially in 
the Algae. The last Sermon deals with the cell-membrane in 
bacteria, » alge, Mosses, ferns, and seed-plants, and the changes 
it sa Pl, both structural and chemical—such, for instance, as 
are associated with formation of pectoses, gums, cork, cutin, wood, &c. 
amount of research, an 
the vi represents a vast 
with references to original papers, which are placed at the bottom 
of each page, and occupy as much as one-fourth to one- 
third of the space. It should a useful work of reference to 
prove a 
there interested in this phase of plant-physiology. A.B.R 
