REVIEWS 859 
tion of claims; also one each to the acquiring of a title before the 
patent and to the patent itself. The different kinds of claims, as 
lode claims, placer claims, lodes in placers, tunnel claims, mill sites 
and water right claims are systematically treated. Passing by some 
chapters on special themes we may note those on the rights of mine 
owners and of miners respectively, and the one on the application 
of equitable principles and remedies to mining operations. An 
appendix embraces the United States statutes relative to mineral 
deposits and the land office regulations. A very large number of 
cases are cited and briefly abstracted in illustration of the general 
treatment of the several themes. tea. 
The Science of Brickmaking - with some Account of the Structure 
and Physical Properties of Bricks. By GrorGe F. Harris, 
F.G.S. 160 pp. H. Greville Montgomery, London, 1897. 
Professor Harris has presented in this little volume an admirable 
elementary treatise upon the science of brickmaking, which cannot 
fail to be of much value to the more intelligent class of brickmakers 
and clayworkers generally. The subject is logically and systematically 
discussed and is illustrated with a large number of local examples of 
brick-earths. The book contains much new information upon one of 
the most important economic subjects with which the geologist comes 
in touch. It is significant to see a man of Professor Harris’ scientific 
attainments in the more theoretical and technical phases of geology 
turning his attention to so thoroughly practical a subject as that of 
brickmaking. Professor Harris rightly thinks that too many geolo- 
gists do not sufficiently regard the economic aspects of their science, 
and he is preparing to present to the English-reading public still fur- 
ther contributions upon the practical side of geology. 
The book opens with a discussion of the different types of brick- 
earths, which are classified as fluviatile, lacustrine and fluviatile, and 
marine. Following this are chapters devoted to the mineral constitu- 
tion of brick-earths, and the behavior of the various minerals in the 
kiln. In this connection the author clearly points out that the chem- 
ical analysis does not always afford the needed information to the 
brickmaker, but that the physical constitution of the materials also 
has great influence in determining the value of the brick-earth. 
