502 The American Naturalist. [June, 
by a general statement, by the Director, Professor C. O. Whitman, of 
the work and aims of the laboratory from which we learn that already 
75 papers have been published, the direct outcome of the laboratory 
in its six sessions. 
The volume is well printed and we look for a large sale for it, for it 
certainly should be in the hands of every one who wishes to keep him- 
self informed of the present tendencies of biological science. 
Report of the United States Fish Commissioner for 1889- 
91. —This volume contains in addition to the official report of the 
Commissioner, the results of inquiry respecting Food-fishes and the 
Fishing grounds of the United States, by Richard Rathbun, and a 
statement of the Methods and Statistics of the Fisheries, by H. 
Smith. together with six papers published as appendices to the report. 
Among these is Heckel’s “ Plankton-Studien,” A Comparative Inves- 
tigation of the Importance and Constitution of the Pelagic Fauna 
and Flora, translated by George W. Field 
Mineral Resources of the United States, 1892.’—This vol- 
ume shows the progress made in the development of the mineral pro- 
ducts of the United States in 1892. The statistical tables are carried 
forward from former reports to the close of 1892, but the desetini 
matter has been brought up to a late date in 1893. 
*Report of the United States Commissioner of Fish and Fisheries for 1889-91. 
Washington, 1893 big 
*Mine esources of the United States for 1892. David T. Day, Geologist m 
Charge. Washington, 1893. ; 
