104 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



fino screw, which extends beneath the stage for its whole length, and is 

 actuated by the milled head on the right. To this is attached a 

 graduated disc, which reads against a fixed index, tho movable plate 

 having also an index. Over tho front of the objective is a plane mirror 

 of polished silver, with a central aperture through which the object is 



Fig. 2. 



viewed. The mirror being inclined at 45 3 , reflects the light upon the 

 object on the stage, which is always viewed as an opaque object. The 

 mirror rotates in a collar socket to vary the illumination. There is a 

 fine-adjustment screw (usual Continental form) at the top of the pillar, 

 and a screw eye-piece micrometer forms part of the body-tube. For 

 levelling the instrument one of the feet has a screw by which it can be 

 lengthened or shortened. 



Lenhossek's Polymicroscope. — Dr. J. v. Lenhossek has applied the 

 principle of the revolving stereoscope to the Microscope in a very 

 ingenious manner. The instrument is shown in perspective in fig. 3, in 

 profile in fig. 4, and in section in fig. 5. The essential feature consists in 

 an endless band M M (fig. 5) turning on the upper and lower axles K L, 

 and carrying 60 ordinary 3 X 1 in. slides, N. The slides lie horizontally, 

 but as each slide comes to the top it stands vertically, and the object is 

 observed through the opening H, in the side of the box A, by the Micro- 



