324 THE MICROSCOPICAL NEWS. 
With regard to the charge of “ mutilation,” we refer our readers 
to the two articles, when we feel sure they will consider the charge 
non-proven. 
OSTEOLOGICAL SPECIMENS.—Mr. E. Wade Wilton, of Leeds, has 
sent us the skeleton of a frog, such as he prepares for the use of 
students in Biology. Two series are supplied ; the cheaper one is 
permanently fixed to the card, whilst in the other each separate 
bone can be detached for examination. The price to teachers is 
38s. and 30s. per dozen. 
PRACTICAL BroLocy Ciasses.—The Manchester School Board 
have made arrangements to hold Classes during the evening 
Science Session (October to May) in Practical Botany and Practical 
Biology. 
In the Practical Botany Class Students will have the opportunity 
of studying the Structure and Classification of Plants by the exami- 
nation of fresh specimens. For this purpose the necessary apparatus 
and materials will be provided. 
The Practical Biology Course will be that of Huxley and Martin, 
and will include the Life History and Structure of the following 
Plants and Animals :—Yeast, Protococcus, Chara, Fern, Flowering 
Plant, Bacteria, Amceba, Paramcecium, Vorticella, Hydra, Lobster, 
Freshwater Mussel, and Frog. 
The Biology Course will be a great help to students of Botany 
and Physiology, and to those preparing for the B. Sc. and other 
Examinations, and will be especially invaluable to those possess- 
ing Microscopes, as the Course embraces practical instruction in 
the preparation, staining, and mounting of microscopic tissues and 
organisms. 
Hypra.—The conclusion of Mr. Dunkerley’s paper on Hydra is 
unavoidably postponed until our next. 
Co.r's Stupirs.—We are very glad to notice that the celebrated 
* Studies in Microscopical Science,” have been again resumed. No. 
4 contains a dissertation on the cell theory, illustrated with two 
beautiful plates. 
The third part of “‘The Methods of Microscopical Research” 
has also been issued, so that we hope Mr. Cole has surmounted all 
his difficulties. 
NOTE ON THE SECTIONS OF PINNULARIA.—We have been 
favoured with a drochure from Mr. Prinz on the above subject, 
alluding specially to Mr. Burgess’ paper in our March number. A 
translation of this paper will appear in our next. 
ERRATA, 
Page 275, line 17, for ‘‘ by their ” read for their. 
Page 277, line 16, for ‘‘ quatnox” read quatuor. 
Page 278, line 7, for ‘‘ short-hooked” read short, hooked. 
