Reviews—Prof. A. H. Green’s Geology. 233 
The report on the minerals of N. 8. Wales by Prof. A. Liversidge is 
the second edition of a paper published in the Trans. Roy. Soc. N.S. 
Wales for 1874. Since that time every opportunity has been taken 
advantage of, to correct and add to it; special attention has been paid 
to the chemical composition of the minerals, and a useful list of localities 
is appended. 
The Catalogue of the Reports and Works on the the Geology, 
Paleontology, etc., of the Australian continent by Messrs. R. Etheridge, 
junr. and R. L. Jack, has been already noticed in the GuoLoeIcaL 
Magazine (1883, Vol. X. p. 44). J. M. 
I11.—Geotogy. Part I. Puysican Gronocy. By A. H. Green, M.A., 
F.G.8., Professor of Geology in the Yorkshire College, Leeds. 
Third Edition. (London: Rivingtons, 1882.) 
N the Grorocican Magazine, for January, 1877, the first edition of 
this excellent manual was brought before the notice of our 
readers; we have now much pleasure in calling attention to the 
third edition. The author has abbreviated the title of his work, 
changed his publisher, increased the number of pages from 552 to 
728, and the number of woodcuts from 143 to 236. The change 
of title is right—the book is admirably adapted for advanced students 
and teachers, but is by no means likely to attract ‘‘ general readers.” 
‘The first 186 pages of the work are devoted (with the exception 
of a short historical sketch) to Mineralogy and Crystallography, rock- 
forming minerals and rocks, and it is only when we come to ‘‘denuding 
agents and how they work” (page 187) that the matter would be 
at all interesting to an elementary student or general reader; and he 
might read on happily through the next chapter, which tells him 
what becomes of the waste produced and carried off by denudation, 
and describes the method of formation of bedded rocks, and some 
structures impressed on them after their formation. Chapter v. 
(pp. 804-338) contains a lithological description of the ‘‘Confusedly- 
crystalline rocks,” and is necessarily dry, though a capital introduction 
to Petrology. In this way, with alternations of pleasant and easy 
reading on volcanos and volcanic action, and subterranean disturbances, 
with more or less detailed accounts of rocks and rock-structure, we 
reach chapter xii., which deals with Mineral Deposits and Metallic 
Ores. 
One of the most interesting portions of the book (chapter xi.) 
explains how the present surface of the ground has been produced by 
sea and subaerial agents. In speaking of the origin of certain lakes, 
Prof. Green says, ‘‘ The arguments in favour of the glacial origin of 
many rock-basins are very forcible, even though we may not yet have 
hit on the exact nature of the mechanism by which ice has been able 
to scoop out these hollows; but while we admit this, we must not lose 
sight of the possibility of some rock-basins, specially some very large 
ones, having been formed by subterranean movements in the manner 
already described.” Chapter xiv. on the original fluidity and present 
condition of the interior of the earth—the cause of upheaval and 
contortion—the origin of the heat required for volcanic energy and 
metamorphism—with remarks on speculative geology; and chapter xy. 
