614 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



Herr Reichert also mounts two doublets of 10 and 20 power in a 

 nickelled frame (fig. 97, natural size). When not in use they are 



Fig. !)7. 



turned back within the frame, or for examining an object, brought out 

 as shown in the fig. 



Geneva Company's Dissecting Microscope. — This, fig. 98, con- 

 sists of two parts, a support for the lenses and a stage and mirror. 



Fig. 98. 



The two are quite separate, a plan which gives more freedom of action 

 than can be obtained in the ordinary form of dissecting Microscope. 



The lens-support can be raised by a pinion acting on a rack on an 

 inner tubular pillar. It can also be rotated in a horizontal plane on 

 the top of the latter or in a vertical plane on the pivot clamped by the 

 second (upper) milled-head. 



The stage has side rests for the hands and can be screwed to the 

 top of the box holding the instrument. The mirror is rotated on its 

 axis by the milled-head shown on the right. On one side there is an 

 ordinary concave mirror and on the other a plane one of opal glass. 



Drallim and Oliver's Microscope Knife.— The following is taken 

 from the advertisement of this knife (fig. 99) : — 



" It comprises a great variety of articles including a large dagger- 

 blade, small penknife, pair of folding scissors, corkscrew, nail-trimmer 

 and file, tortoise-shell toothpick and ear-scoop, nickel silver tweezers, 



