REVIEWS. 
71 
be able to adopt tbe process, and so while be might benefit the State he 
•would certainly ruin his neighbours. But his neighbours are too cunning 
for this ; so when they discover a secret in dyeing, or any other chemical 
process out of which money can be turned, they simply keep it to themselves, 
and make money out of it while they can. The author, therefore, cannot get 
hold of it, and of course he cannot put it into his book. But, with this 
exception, Mr. Slater’s manual is a capital little work, well arranged, and 
with almost sufficient information on all subjects connected with the dyer. 
The reader, taking these facts into consideration, will, we should think, 
consider the manual a convenient and well-informed assistant, as we do. 
TERSE GEOLOGY.* 
H ERE is a curious book ; a small one, and nevertheless a very useful one, 
which we wonder, now that we see it, has not made its appearance 
earlier. It is evidently a concise, clear, and well-arranged note-book to the 
lectures of the eminent men who have produced it. We say a note-book, 
for of the materials of a note-book does it consist; but it must be remembered 
that it is the note-book not of a student, but of a professor, and one too 
which emanates from two men, one of whom is one of the most thorough 
geologists in the kingdom. It is intended as a guide to the courses of 
lectures of two professors of geology and mineralogy — a very full note-book, 
to be sure, but still merely a note-book, to assist the student in placing 
together a vast amount of information to be derived from other sources. 
This is what the authors say of it : — u The student will, on his part, find clear 
statements and explanations of the things, facts, and circumstances on which 
geology is based, whether he reads lecture by lecture, or begins with some 
particular subject, or according to some chosen classification, such as either 
of the eight courses of lectures may supply. In either case he must make 
the matter his own by cross-references, using the index as explained in its 
prefatory note. Thus he will pursue a systematic study of every subject 
and set of subjects, either according to the lectures, one of the Synopses, or 
any plan that his own reading or his teacher may suggest. Only by classi- 
fying on some principle or other can a student master scientific knowledge.” 
We can only say that if the student follows the advice above given, he will 
become master of geology in a comparatively short period, and he will have 
learned one of the best methods of making himself familiar with a complex 
subject. We have only one regret, and that is the want of a few typical 
illustrations. These are certainly required ; and we trust that in the next 
edition, which must be nearly ready even now, the authors will take our 
advice so far. In every other particular the work, though small, is every- 
thing we can desire. 
* u Geology.” By John Morris, F.G.S., Professor of Geology and Mine- 
ralogy in University College, London; and T. Rupert Jones, F.G S., Professor 
of Geology and Mineralogy, Royal Military College, Sandhurst. First 
Series. Van Voorst. 1870. 
