258 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



Bausch and Lomb Optical Co.'s TricMnoscope.* — Figs. 40 and 

 41 show the Trichinoscope recently issued by the Bausch and Lomb 

 Optical Co. It consists of two metal plates, each pierced with a central 

 hole and hinged together at one end, and so arranged that they can 

 be forced together by the screw at the opposite end. Two glass plates 



Fig. 40. 



n. 



are inserted between them. A simple Microscope can be moved in 

 different directions across the apertures in the plates so as to com- 

 mand a view of every part. It is focussed by being screwed up and 

 down in the socket at the end of the arm which carries it. 



Fig. 41. 



A thin slice of flesh having been moistened with a mixture of 

 equal parts of acetic acid and glycerine, is put on the lower glass plate 

 and spread out by needles or a brush, the second plate is brought 

 down upon the lower one and the screw is placed in the slot into which 

 it fits. By turning the screw any degree of pressure may be brought to 

 bear on the flesh, which may thus be rendered so thin and transparent 

 that any trichinse present will be readily visible when the Trichino- 

 scope is held up between the eye and light. 



"Hampden" Portable Simple Microscope. — This instrument 

 (Figs. 42 and 43) is made by Messrs. Beck and is the device of the 

 wife of a distinguished English statesman now ruling in India, It 

 combines, with great portability, very convenient arrangements for the 



* Araer. Jour. Micr., vi. (1881) pp. 183-5 (.S figs.). 



