BOOK-NOTES, NEWS, ETC. 819 
cations of the University of Chicago. The volume is divided i 
two parts: the first deals with the purely physical aspect of these 
phenomena; the second, which is of more direct interest for the 
botanist, presents the shitialobical results which have so far nse 
achieved in these connections. Part ii. comprises hapte 
The first three—entitled respectively Turgidity, Absorption ead 
Transmission of Water, and Absorption and Transmission of 
the development of diffusion-tensions within the plant-b 
- last chapter, ‘‘ Influence of the Osmotic Pressure of the Sur- 
unding Medium upon Orga: anisms,’’ are brought together the 
retarded in concentrated ones. In some cases at least, the direction 
of new walls is pes influenced by the concentration of the 
surrounding medium. In general, all vital processes are retarded in 
concentrated solutions. Irritability is also greatly influenced by ex- 
ing liquid seem to be due to extraction of water from the living cells. 
Tue success of his previous little book, Mosses with a Hand-lens, 
by which seventy-five to one hundred common mosses of the north- 
eastern United States can be easily identified with the help of a 
simple lens of ten to fifteen diameters, has induced the author, 
Dr. A. J. Grout, to prepare a more detailed work—Musses with 
Hand-lens. and — (New York, 1903. Part i., 86 pp.; 10 
plates and 81 figures in the text; price one dollar)—which will 
uffice for the determine titin of twice as many species. Part ii. 
will probably appear next January, and two or three more instal- 
ents will complete the work. The introductory chapters treat of 
classification and nomenclature, collection and preservation of 
ullivant’s Icones Muscorum, &c. And the whole work is very 
attractive, and is well adapted to the needs of the elementary 
student, but cannot fail to be of great mee _ bryologists who have 
an advanced knowledge of the subject.—A. G. 
ditions that have been made to the European moss-flora 
naa "The whole 5 30 pa cost nearly £8, and will consist of 
