668 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
MICROSCOPY. 
A. Instruments, Accessories, &c.* 
Cl) Stands. 
Large Binocular Microscope designed and made by an Amateur. 
— At the meeting of the Society on November 16th, the President 
brought under the notice of the Society a large binocular Microscope 
(fio. 113) which was not only designed, but actually made by an amateur, 
and accompanied an exhibition of a photograph of the instrument with 
the following remarks. 
“ The three largest Microscoj)es that have been constructed since the 
introduction of achromatism, with which I am acquainted, are first, 
Tulley’s, 1826.f The second was made by G. Lowden, jun., of Dundee, 
in 18514 This was 4 ft. long, had a body-tube 4 in. diameter, and 
weighed 1J cwt. The third was made by C. D. Ahrens, and was ex- 
hibited before this Society in 1888. It 1 ad a body-tube of 4^- in. 
diameter, and it stood 2j ft. high.§ 
“ Of these three the second can hardly be called a practical construc- 
tion, and the third was intended solely for polariscope w r ork ; on the 
other hand, the one represented in the photograph, although large, is a 
practical and serviceable working instrument. A one-foot rule is placed 
* This subdivision contains (1) Stands; (2) Eye-pieces and Objectives; (3) Illu- 
minating and other Apparatus; (4) Photomicrography; (5) Microscopical Optics 
and Manipulation; (6) Miscellaneous. f Carpenter, 7th edition, fig. 112, p. 147. 
X Journ. R.M.S., 1882, p. 851, fig. 156. § Op. cit., 1889, p. 273, fig. 39. 
