34 
REVIEWS. 
by a disc of bluish-black neutral tint glass placed obliquely in front of the 
chimney. Parallel to this disc, and behind the chimney, is placed a 
metallic reflector, which concentrates the light. 
For the engravings which illustrate the above remarks, from the 
work of Dr. Schacht, to which we have already referred, we are indebted 
to the liberality of its publisher. 
We would gladly have loitered over the microscope and its appur¬ 
tenances, but we are reminded that our space has been nearly occupied, 
while those who have devoted, we might almost say, the energies of their 
life to its study and use are waiting an introduction to any of our readers 
with whom they have not had a previous acquaintance, and with each of 
whom we will only say a few words, trusting that those to whom they are 
addressed will cultivate a closer personal acquaintance. 
We have already expressed our sense of the importance of the “ Treatise 
on the Use of the Microscope,” by Mr. Quekett, which is deservedly entitled 
a practical treatise, as in it nearly every difficulty which the practical ob¬ 
server meets with has been ably and lucidly treated. To give extracts 
from such a work would be almost impossible, as any isolated fragments 
would convey a most unjust, because inadequate, idea of its merits; we 
. may, however, glance at its general arrangement, so as to show those of 
our readers who may not be possessed of it (and we should say they are 
few) how rich its treasures are. Mr. Quekett divides his treatise into 
three divisions, or parts, which treat severally of Mechanical Arrangement , 
The Use of the Microscope , and Manipulation. To the first of these we 
have already referred in our glance at the history of the microscope, 
with which the work opens, affording, in its' introductory chapter, a 
valuable sketch of its chequered career, which interested us not the less 
because some of our own earlier observations were made with such rude 
instruments as are figured and described in it. This chapter is followed by 
an account of the simple and compound microscopes, and the accessory 
instruments used with them. In the present edition (the second) a 
seeming omission made in the first has been corrected, by a description 
being added of all the best instruments made by our Continental neigh¬ 
bours. We were glad to see this addition, as, while it does full justice to 
the ability and skill displayed by such makers as Plossel and Schiek, of 
Vienna; Pistor, of Berlin; and—names still better known to the English 
microscopist—Oberhauser and Nachet, of Paris, it also shows the manifest 
superiority of instruments made by Smith and Beck, Ross, and others 
whose names are as familiar to us as household words. This part con¬ 
cludes with a chapter “ On the Magnifying Powers used with Simple and 
