NOTES AND QUERIES. 207 
quick perception of details, as well as giving precise ideas of the 
magnification or minuteness of the objects seen. 
For those who find a little difficulty in drawing a true outline of 
any object under view, a useful accessory has been devised, termed 
the Camera Lucida, by which a person, without the slightest know- 
ledge of drawing, may trace an exact copy of any observation he 
may wish to preserve. A very good substitute, however, and much 
cheaper is the neutral tint reflector, introduced by Dr. Beale; a 
simple form of which, made with a small piece of tin and an ordi- 
nary cover glass, was distributed by Mr. W. Stanley, F.R.M.S., to 
all the members present. 
He illustrated its use by drawing several objects, and also showed 
its value in connection with the stage micrometer in determining 
the exact size of the object, as well as the magnifying power of the 
various objectives used. 
In the senior division, Mr. E. Ward, F.R.M.S., was the demon- 
strator, his subject being Micro-crystallization. Crystallography is 
full of interest for all, but especially is it of importance to the 
physicist, the geologist, and the chemist. 
Mr. Ward commenced with tartaric acid in water, then gallic 
acid in methylated spirit, and hippuric acid in pure alcohol, 
chlorate of potash, both the dendritic forms and separate crystals, 
and concluded with asparagin or aspartic acid. Altogether about 
fifty slides were mounted and distributed. 
STUDIES IN MICROSCOPICAL SCIENCE. Edited by ARTHUR 
CHARLES COLE, F.R.M.S. 
We have been given to understand that Vol. II. of these studies 
will commence on the 7th July, 1883. The work is to be divided 
into the three following sections, which will be paged separately so 
as to suit the wants of the subscribers. 
Section I. will commence with No. 1, on the 7th July, to be 
continued in monthly numbers : it will open with a chapter on the 
morphology of the animal cell, and in addition to a complete set 
of lithographed illustrations and microscopical preparations, will 
contain ample references to other works and a large proportion of 
original matter. The remaining chapters will, we presume, be 
similarly treated, and close with full bibliographical notices. The 
work will be continued monthly until completed, when it will form 
a compendious treatise on comparative histology based on develop- 
mental considerations. Examples are to be chosen both from 
vertebrated and invertebrated animals, and in this will it differ 
from the majority of text-books on the subject. 
Section II. will treat of botanical histology, to commence with 
No. 2, on the 21st July, 1883, and to be continued monthly there- 
after. 
