166 
POPULAR SCIENCE REVIEW. 
FIELD GEOLOGY .* 
A CAREFUL geological survey of a country or district is of essential 
importance, in order to obtain an accurate knowledge of the position, 
extent, and composition, of the different formations, in regard to either their 
scientific or their economical bearings. Aid in this direction it is partly the 
object of Field Geology to supply. The second edition of this work is con- 
siderably revised and augmented, additional matter to the extent of one 
hundred pages being incorporated throughout. The work consists of five 
parts; the first and second parts comprise an account of the necessary 
instruments, and their application for geological surveying, with diagrams 
and examples illustrative of the manner of tracing boundary lines of forma- 
tions and constructing geological maps, and thus includes such instructions 
as are essential to the working out, either for scientific or practical purposes 
the geology of a district. The third, or lithological part, contains some 
general remarks on the character and structure of rocks and veins, notes on 
the more common minerals and metallic ores, their mode of occurrence, and 
the means by which minerals and rocks are determined ; this is further use- 
fully illustrated by a series of tables of tests for their determination in the 
field or in the cabinet. 
The Palaeontological part, by Mr. Jukes-Browne, is much improved and 
enlarged, and lists are given of the characteristic genera of each geological 
system, and of characteristic fossils of the chief sub-formations of each 
system. 
The fifth part is devoted to the scientific and practical results of field 
geology, and treats of springs, streams, artesian wells, and physical features, 
as dependent on the geological structure of the district with which they are 
associated. A few typographical errors occur in the lists of fossils ; the 
older palaeozoic rocks, Cambrian and Silurian, are differently grouped by the 
two authors at pp. 51, 280 ; and the latter again does not quite accord wfith 
the remarks in the last paragraph on p. 266. 
Altogether the work is considerably improved, and will form a useful 
field guide to those engaged in geological surveying. 
* A Text-Book of Field Geology. By W. Henry Penning, F.G.S. With 
a section on Palaeontology. By A. J. Jukes-Browne, B.A., F.G.S. Second 
edition, revised and enlarged. Sm. 8vo. London: Bailliere, Tindall, and 
Cox. 1879. 
