10 On the Binocular Microscope. 



used with the T ^ oil immersion, the student should try 

 it, and see what a different view it gives of various 

 structures and their relation to one another. Any or- 

 dinary stand made on the Jackson -Lister model will do, 

 so that the body can be brought almost into contact 

 with the stage. A Zeiss' D can be made to work per- 

 fectly well by fitting the front part into an adapter, so 

 as to bring the lenses close to the prism. The relief 

 to the eyes is very great. 



For a higher power Messrs. Powell and Lealandmake 

 their T ^ oil immersion with a screw cut on the outside, 

 so that the front part containing the lens can be screwed 

 into an adapter, which they supply with the glass. By 

 this means perfect stereoscopic effect is obtained, and 

 the observer is enabled to realise the precise relations of 

 the different structures he is looking at to one another. 



