ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 



543 



White-Cooper. This instrument was exhibited by Mr. Jacob Pillischer 

 at the March meeting (see p. 245). Fig. 121 gives a general view of the 

 instrument, and fig. 122 shows the Tomes stage opened out and the 

 method of pivoting the three oval plates. When used as a dissecting 

 Microscope, these plates form convenient tables on which to place 

 specimens and small instruments. 



Fig. 122. 



New Portable Microscope. — This Microscope, figs. 123 and 124 y 

 exhibited at the June Meeting by Dr. C. Charlton Briscoe, was made 

 from the design of Prof. Herbert Jackson by Messrs. Swift and Son, 

 who suggested several of the details in its construction. It is specially 

 designed for use at the bedside, and, considering the work it is capable 

 of doing, is of unusually small dimensions. 



The body, which can be extended by a draw-tube to 160 mm., slides 

 in a cloth-lined fitting; it has an eye-piece. of K.M.S. standard gauge, 

 and the nose-piece takes objectives with the standard screw-thread. 

 The fine adjustment is steady with the highest powers. 



The stage, which is one of the chief novelties in this instrument, has 

 £-in. motion vertically and transversely, the latter motion being in arc* 

 The substage condenser is achromatic and has an aplanatic aperture of 

 0*92 ; the top lens can be removed when using low powers. It is fitted 

 with iris diaphragm and throw-out cell and screws for centring. 



* The transverse movement of the stage in arc is not new. A figure of a Micro- 

 scope, made about 1855-60, having a stage with this movement, is given in the 



Joum. R.M.S. for 1898, p. 668. 



2 N 2 



