676 REVIEWS 
The Inland Lakes of Wisconsin. By Epwarp A. BiIRGE and 
CHAUNCEY JuDAY. Bulletin XXII, Scientific Series No. 7, of 
the Wisconsin Geological and Natural History Survey. 
This report deals with the dissolved gases of the water and their 
biological significance. Five years have been spent in this investiga- 
tion. The work was first undertaken and outlined by Mr. Birge, who 
has kept general oversight over the work throughout the investigation 
and who has prepared the introduction to the present volume, but Mr. 
Juday has taken more and more of the responsibility of the investiga- 
tion and is credited with the preparation of the body of the report. 
As stated in the opening chapter, the primary object was to make 
a general survey of the lakes situated in various parts of Wisconsin in 
order to ascertain the status of the physical, chemical, and biological 
conditions which exist in them. Special consideration was given to 
lakes existing in different portions of the state and under different cli- 
matic conditions. The waters were examined for their content of oxy- 
_gen, carbon dioxide, nitrogen, methane, carbon monoxide, and some 
other gases, and analyses were made of the mineral content. 
The report gives a reasonably full account of the dissolved gases in 
the waters and sets forth the seasonal variations of these gases, their 
vertical distribution, the effect of the seasons and the plankton on the 
quantity and distribution of the gases, but the authors frankly admit 
that many of the biologic problems associated with their studies have 
not been solved. 
The question why different lakes that are of about equal age, that 
have the same species of plankton, where temperatures do not differ - 
widely, where the chemistry of the waters is not greatly different, where 
the planktons have had apparently the same advantages for develop- 
ment, differ so widely in productivity or ability to support a population _ 
of plankton, is not solved, and many other problems of a biological and 
chemical nature have arisen during the investigation which invite 
further study. 
W. W. A. 
Allas photographique des formes du relief terrestre. Selected and 
prepared for publication by an international Commission 
appointed at the Ninth International Congress of Geography. 
The plan of this atlas involves the preparation of nine volumes each 
to contain 48 plates, and each plate to be accompanied by a text descrip- 
tive of the geologic and physiographic features shown in the view. The 
