20 Microscopic Apparatus. [Sess. 



Mr A. Frazer, M.A., Secretary of the Microscopical Section, 

 exhibited at this meeting tlie following pieces of apparatus, 

 some of which had been forwarded to him for exhibition by 

 Mr H. Crouch, of London : — 



(1.) Crouch's Large Premier Microscope of the Binocular Pat- 

 tern. — It was explained that this instrument did not differ in 

 any marked manner from other large instruments of its class, 

 and that it was exhibited chiefly for the purpose of enabling 

 members to examine a large modern microscope of the best 

 construction. 



(2.) Crouch's Photo- Micrographic Camera. — This camera is 

 similar to an ordinary photographic camera of small size, but 

 is provided, at the part to which the lens is usually fixed, 

 with a flange carrying a tube of the same dimension as an 

 eye-piece tube. By this device the eye-piece can be with- 

 drawn, and the camera put in its place, thus affording a ready 

 means of preparing photo-micrographs. 



(3.) An Imjjroved Tripod Knife-Carrier for Freezing and 

 other 3ficrotomcs : by A. Frazer. — This knife-carrier is so 

 arranged that an ordinary razor occupies the place of the 

 specially prepared knife in a Williams' microtome knife- 

 carrier. It was explained that special knives are not, in 

 many cases, readily to be procured, and are always more difficult 

 to sharpen than an ordinary razor ; hence the need of this new 

 knife-holder. The method of holding the knife now adopted 

 (that of grasping it by the handle end) avoids the incon- 

 venience, sometimes found in the Williams' instrument, of the 

 knife-clamp rubbing against the tissue at the time of cutting. 



(4.) Crouch's Pctrologist's Microscojoe. — It was explained that 

 this instrument had been made at the suggestion of Prof. 

 Geikie and others, and was intended to meet the wants of 

 those desiring a good petrological microscope at a moderate 

 price. 



(5.) The Syracuse Solid Watch-Glasses. — These are glass 

 dishes with a concavity similar to an ordinary watch-glass, 

 but are made of glass about half an inch thick, so that they 

 may not readily be overturned. The glasses are intended for 

 staining sections and similar purposes. 



