FREY, ON THE MICROSCOPE. 39 
Das Mikroskop, und die mikroskopische Technik ; ein Hand- 
buch fur Arzte und Sludirende. (The Microscope, and 
its Mode of Application, &c.) By Dr. Hernricn Frey. 
8vo, Zurich, 1863, pp. 472. 
A wELL got-up and imposing-looking work on the micro- 
scope has lately appeared under the above title, which, 
however, is anything but fully expressive of its contents. 
The work, in fact, consists of two principal divisions. 
The first 156 pages only relate to the instrument itself, 
its appurtenances, and the various methods to be followed 
in the observation, preparation, and preservation of objects; 
the remainder, except the last 22 pages, is simply a sort of 
compendium of such parts of histology as.may be useful to 
the medical student. The last 22 pages, which are num- 
bered consecutively to the rest, and evidently intended to 
form part of the book, contain merely lists of prices of the 
various forms of instruments constructed by all the more 
eminent continental and English makers— matters, we 
should conceive, hardly worthy of being placed in the body, 
as it were, of a professedly scientific work, though useful 
enough perhaps to the student who may be in search of an 
instrument, and at a loss to know where to look for one 
suited to his wants or means 
The technical part of the book appears to have been con- 
ceived with the same design, and pretty much on the plan—a 
little amplified it is true—of Dr. Beale’s excellent ‘Microscope 
in Clinical Medicine, and How to Work with the Micro- 
scope.’ 
Considering its scope and objects, the work, though perhaps 
scarcely called for, in the presence of so many others of the 
same kind, is well done, and contains a great amount of 
useful information. 
The seventh section or chapter is particularly full upon the 
subject of the application of reagents of different refractive 
power, or different chemical properties in the examination of 
objects; and we are unacquainted with any work in which 
these matters are better treated of. The eighth section is 
devoted to colouring matters; and with reference to this we 
may remark that Dr. Frey does not seem to be acquainted with 
the peculiar effects of magenta-dye on the blood-corpuscles, 
nor of tannic acid on the same bodies. 
We have already observed that the book is well got up. It 
is beautifully printed, and on excellent paper, and abundantly 
