240 



The Microscope. 



the leading preparers, with more or less slight variations as to finish 

 of cells and media used in mounting. 



For the arrangement of type -plates of diatoms, the guide-lines 

 and squares ruled on the cover-glass carrier serves to easily allow 

 the forms to be adjusted in lines and properly spaced with 

 the same ease as in symmetrical grouping. When such 

 beautiful results as I have seen are produced by simple and 

 inexpensive means, it seems to be not worth while to attempt this 

 class of work with compound microscopes with mechanical fingers 

 and ruled guides set in eye-piece as seems to prevail in the United 

 States. 



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In order that^specimens of slides^ by Herr Getschmann may be 

 appreciated, and at the same time answer the purposes or illustra- 

 tion, I add a plate sketched off-hand, showing two arrangements 



