268 The American Geologt8t October, 1893 
tion of fossil ore; The iron furnaces: Manganese; Local distribution of 
manganese ores in the Knox series: Origin of Manganese and iron ores; 
Aluminum ores; Beauxite; Aluminum, its sources and uses (by R. L. 
Packard); Coal: Limestone, limerocks, cement rocks; Sandstones; Slates; 
Clays and brick pavements; Waterpowers and timbers; The location of 
roads and their relationship to the physical and geological features; Good 
roads versus bad roads: Formation and characteristics of soil of the 
paleozoic belt of Georgia; Geological and chemical relationship of the 
soils of the paleozoic formations; Geological relationship of the soils 
of the Agricultural Experiment Station of Georgia, and of the Col- 
lege Farm. 
The volume cloees with ''acknowledgements and progress of the sur- 
vey,'" embracing the law of the survey, approved November 12, 1889. 
The "table of contents" is immediately before the index, where it will 
rarely be seen for the uses for which such a table is intended. 
Throughout the progress of this work the chief has been handicapped 
by the appointment and bare-faced maintenance on the survey of polit- 
ical assistants, whose work ho would not accept, among which was the 
farcical discovery of worthless diamond mines. Furthermore, the sur- 
vey has been attacked by interested but unscrupulousgold miners, who, 
without his indorsement, could not put their lands upon the market. 
These found no sanction with the state geologist. In short, according 
to the statements of the Georgia public press, the governing board was 
the most incompetent and worst that any survey has ever known. We 
congratulate the author of this report on accomplishing what he did, 
and on his manful resistance of the political machinations that sur- 
rounded him up to the moment of the completion of the volume. 
Ore Deposits of the United States. By James F. Kemp, Professor 
of Geology in the School of Mines, Columbia College. 8vo, pp. xvi., 
302, with 60 illustrations ; Scientific Publishing company, New York, 
1893. Price $4.00. 
This work represents principally the material which Prof. Kemp 
collected and used in his class lectures at Cornell University and 
Columbia College. The subject is divided into two parts. The first is 
a general discussion of the geoiogy and structural relations of ore de- 
posits in general. Their genesis is discussed and the more recent 
views of prominent investigators are given. The three principal divis- 
ions of Prof. Kemp's scheme for the classification of ore deposits are : 
I. Of igneous origin ; II. Deposited from solution ; III. Deposited 
from suspeniion. The instances mentioned of the first class are 
wholly iron ores, and all those in the third class are iron ores except 
gold placers. Under the second class, therefore, are included all other 
varieties of ore deposits, of whatever mineralogical or structural 
peculiarities. 
The second part is devoted to a systematic description of the mineral 
deposits of the United States, with a brief notice of the geological age 
and manner of occurrence of the more important deposits of each 
