REVIEWS 547 
results are somewhat less valuable for general comparison, though still 
of great importance. As a whole the report is to be highly com- 
mended. It is concise and fresh. It tells not only about North Carolina 
clays, but incidentally it gives the point of view of the modern student 
of clays. While no new methods are developed, there are no modern 
methods of value which have been overlooked. In addition to its 
other excellent features the paper is well printed and sufficiently illus- 
trated. H. F. Barn. 
Lehrbuch der praktischen Geologie. Arbetits- und Ontersuchungs- 
methoden auf dem Gebiete der Geologie, Mineralogie, und Pale- 
ontologie. Non Dr. Konrap Keiiuack, Kel. preuss. Lands- 
geologen in Berlin. 639 pp. Stuttgart, 1896. 
The title of this book fairly indicates its scope. It is essentially an 
exposition of the results to be sought in the field, and in the laboratory 
study of the materials gathered in the field, and of the methods by 
which these results are attained. It is the only book with which we 
are familiar which essays to deal with so comprehensive a subject. 
Geikie’s Outlines of Field Geology covers in a briefer way some part of the 
ground of the present volume. Richtofen’s ihrer fir Forschungs- 
reisende gives many suggestions along the same lines. Nevertheless 
the present volume is so much more comprehensive than anything 
else which has been written on the subject that it may fairly be said to 
be without a rival. 
Formidable as was the task which the author set for himself in the 
preparation of this work, it must be said to have been well done. 
Probably no two geologists would give instructions for the same work 
in the same way, and no one could be expected to make a treatise on 
so broad a subject equally satisfactory in all its parts; yet with all the 
exceptions which might be taken to the order or method of treatment, 
and with all the shortcomings which specialists in this department or 
that might point out (and they are neither numerous nor serious), the 
book might be read with profit by every geologist in the early stages 
of his work, and many parts of it by men who are no longer novices. 
The volume is naturally more satisfactory in those departments of 
geology where study has been longest prosecuted, and where methods 
and principles have become most firmly established ; for example, the 
