1901] MICROSCOPICAL JOURNAL 59 
as’Sedgwick-Rafter, the Plankton net method, the Plankton 
pump, the Plankton krit,each of these given in sufficient 
detail to enable any student to make use of them. In chap- 
ter IV the writer considers the microscopic organisms in 
water from different sources such as rain water, ground wa- 
ter, surface water. The bacteria are largely omitted. There 
is a brief allusion to them as well as one plate describing the 
different types. Then the writer takes up the subject of 
Limnology treating the ponds and lakes, their geology, geo- 
graphy, physics, chemistry, biology and the relation of these 
to each other. The work is an excellent one and should be 
in the hands of one who are interested in the Rady of water 
and its organisms.—L. H. PAMMEL. 
Teat Book of Inorganic Chemisty, By Victor von Rich- 
ter, edited by Prof. H. Klinger of the University of Keenigs- 
berg, and translated by Edgar F. Smith, Professor of Chem- 
istry inthe University of Pennsylvania, Philadelphia. Fifth 
American from the Tenth German Edition, containing 68 
illustrations on wood and a colored lithographic plate of 
‘Spectra. 8 vo. pp. 430. Philadelphia, P. Blackiston’s Son 
& Co., 1900. Price $1.75 net. 
In presenting this subject to the student, the author has 
made it a point to bring out prominently the relations ex- 
isting between fact and theory, which treatment will great- 
ly aid the student in obtaining a thorough knowledge of a 
highly important science. Ample space has been given to 
the consideration of the more recent, well-established discov- 
eries in chemical science and valuable additions have been 
made relating to the general properties and measurement of 
gases, to the atmosphere and the interesting constituents 
lately observed in it, to the theory of dilute solutions and 
electrolytic dissociation, to the electroysis of salts, to alloys, 
etc. This work, which reflects credit upon both author and 
editor, we are pleased to endorse and recommend to the pro- 
fession and scientific public. | 
