Monthly Microscopicall 
Journal, Sept. 1, 1869. J 
CORRESPONDENCE. 
171 
scopes will form their own opinion as to tlie working capacities of 
these microscopes, the best and most expensive of which actually pos- 
sesses " a stage and diaphragms " (!) ; but the "masses " to whom the 
advertisement is addressed will, according to custom, take omne ignotum 
pro magnifico. It is quite clear that Messrs. Cassell wish to do good, 
but that they have not gone the right way about it. On a point of this 
kind they should have sought the aid of the Royal Microscopical Society, 
whose Council and officers would have put them in a better position 
to help scientific education. 
The Histology of the Eye is the subject of some recent lectures 
of Mr. J. W. Hulke, to which we would direct attention. We hope 
in an early number to give an abstract and illustration of the results 
of Mr. Hulke's researches. 
Immersion Objectives. — In answer to our correspondent, Mr. J. 
Newton, of Liverpool, we beg t^say that the subject is receiving 
great attention from some of our best workers. The matter is still 
sub judice ; but we think we may anticipate the final decision by 
stating that, if only from their cheapness, the immersion lenses are 
likely to become very popular in this country. The best glasses 
are those made by Merz, of Munich, and Hartnack, of Paris. An 
advertisement of prices of the lenses of the former appeared in an 
early number of this Journal. 
Microscopy in the Peabody Academy. — We have received the 
first annual report of the Academy of Science founded by Mr. Peabody. 
We regret to notice that while other departments of physical and 
natural knowledge have been carefully attended to, there is no mention 
whatever of a section of microscopy, nor does there seem to be any 
provision in the new museum for the teaching of histology. 
Micro-photographs. — Under the auspices of the Eoyal Academy 
of Vienna, M. Martin has been making a series of photographs of 
microscopic objects. He employed eye-pieces and objectives by Mr. 
Ladd, of Beak Street, and by Hartnack, of Paris. 
COREESPONDENCE. 
The New Univeesal Dissecting Microscope. 
To the Editor of the ^Monthly Microscopical Journal.'' 
Jersey, July 15th. 
Sir, — The June number of your Journal contains an account 
by Mr. W. P. Marshall, President of the Birmingham Natural History 
and Microscopical Society, of a " new universal mounting and dis- 
secting microscope," which he says has been ably worked out and im- 
proved from Ms designs by Messrs. Field, of Birmingham. There is 
a slight error as to the origin of those designs which I should feel 
obliged by your allowing me to correct. 
N 2 
