194, 
REVIEWS. 
Das Mikroskop ; Theorie, Gebrauch, Geschichte, und gegen- 
wartige Zustand desselben. |The Microscope; its theory, 
use, history, and present state.| By Prof. P. Harrine. 
(Translated from the Dutch in German, by Dr. F. W. Tu1Ez.) 
Proressor Hartine’s work on the ‘ Microscope,’ origi- 
nally written in the Dutch language, and consequently a 
sealed book to all but a very few, appeared in three distinct 
portions or volumes, to which a voluminous appendix was 
added last year. The whole was thus brought up to the 
present time. 
These volumes and the appendix are now brought together, 
and constitute a goodly tome of nearly 1000 pages, illus- 
trated with about half as many excellent woodcuts, illustrating 
almost every subject connected with the microscope and its 
adjuncts. 
The present edition, moreover, has been excellently trans- 
lated, under the author’s immediate supervision, by a very 
competent microscopist, into a language which will render it 
generally available, and it may therefore be almost regarded 
in the light of an original work. 
It is, undoubtedly, the most complete and _ satisfactory 
treatise on the microscope that has yet appeared, containing, 
in fact, a compendium of all that can be said, or nearly so, 
on that instrument and its use, and nothing more. For, 
notwithstanding its considerable size, the book contains very 
little matter not having immediate reference in some way to 
the instrument itself or its use. The only exceptions to this 
are the descriptions and figures of crystals, &c., belonging to 
the department of micro-chemistry. It does not include, as 
do most other works on the microscope, copious observations 
and representations of all kinds of so-termed microscopic 
objects, which, though interesting and useful in themselves, 
are scarcely properly placed in the pages of a work pro- 
fessedly upon the instrument by which they are viewed. 
Professor Harting’s treatise is divided into three parts or 
books, of which the first relates to the theory and general 
description of the microscope, including of course its optical 
