REVIEWS 375 
Fourteen plates are made up of copies of Dybowski’s original figures of 
many of the species, of figures showing the surface features of several 
species which were not well illustrated when originally published, and 
of figures showing the nature of occurrence and the association of the 
bryozoa in the rocks. 
In view of the large number of species common to the Baltic and 
the central and northern American regions, the paper is an important 
contribution to the literature of the American as well as to that of the 
European bryozoa. 
Dee Oreree 
Advance Chapters from Mineral Resources for the Calendar Year 
1910: Mica, Graphite, Fuller’s Earth, Quartz and Feldspar. 
Washington, U.S. Geol. Survey. 
Mica, by Douctas B. STERRETT: After introductory paragraphs on 
the micas of commercial importance and their occurrence and uses, the 
statistics for production are given, North Carolina, South Dakota, New 
Hampshire, Colorado, South Carolina, New Mexico, and Massachusetts 
contributed to the total. The value of production of both sheet and 
scrap Increased over that for 1909, in spite of a slight drop in tonnage 
of the latter. 
Graphite, by Epson S. Bastin: The United States produced a little 
less than to per cent of the world’s production in 1910, New York and 
Pennsylvania giving more than half the total value. The year’s pro- 
duction, totaling $377,176, exceeded all previous years in value. Arti- 
ficial graphite was produced amounting to nearly $1,000,000 in value, 
and imports amounted to $1,872,592. Production by states is dis- 
cussed and a paragraph on treatment of the raw material is added. 
Fuller’s Earth, by JEFFERSON MippLeton: A slight drop in ton- 
nage and in average price per ton caused a noticeable decrease in the 
output for 1910. Florida produced more than all other states combined 
at a price slightly above the average for the United States. The total 
value of the product for the year was $293,709, more than twice the 
value of imported material. 
Quartz and Feldspar, by Epson S. Bastin: Introductory paragraphs 
discuss kinds of material, methods of grinding, and uses. The produc- 
tion of quartz showed a drop of 53 per cent in tonnage and 22 per cent 
in value, as compared with 1909. The decrease was due to diminished 
production of quartz for flux in copper smelting and the shutting down 
