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POPULAR SCIENCE REVIEW. 
adjustment. It is supplied with a medium eye-piece, and an inch and 
half inch objectives; and carries a concave mirror, and wheel of 
diaphragms. 
MR. HTGHLEY’S NEW FAMILY MICROSCOPE. 
New Binocular Microscrope . — There are very few instruments of the 
binocular type which can be said to surpass in cheapness, workmanship, 
or clear powers of definition, the instrument which Mr. Collins exhibited 
at the late conversazione in University College. This microscope, which, 
by the way, is constructed upon a plan of Professor Harley’s, seems to 
appeal above all to the working naturalist and anatomist ; for it is so con- 
trived, that a great saving of time is effected in the alteration of apparatus. 
We would call especial attention to the arrangement of parts at the lower 
end of the body of the microscope. Here we find a sort of oblong box 
moving to the right and left of the observer ; in this are placed a 
Wenham’s binocular prism and the analysing portion of the polariscope; 
so that by simply moving this box in the lateral direction, we convert the 
microscope from a binocular into a uniocular, and, if we desire it, can bring 
the polariscope into action also. Those who are familiar with the working 
of our ordinary microscopes, will at once appreciate the advantage of 
Mr. Collins’s arrangement. The eye-pieces are provided with shades, 
which afford considerable relief to the eyes during prolonged investigations. 
This microscope is supplied with the usual accessory apparatus, and also 
with two excellent objectives, 1-inch or 2-inch, and i-inch, and when packed 
in its newly contrived mahogany case, is sold by the maker at the moderate 
price of .£12. There is but one thing in connection with this microscope 
which does not appear to us to be of advantage, and that is, the magnetic 
