1894.] 



MICROSCOPICAL JOURNAL. 



25 



Strauss-Durckheim is represented in outline. It is 

 merely a dissecting microscope of common type with the 

 important addition that the stage, which is carried by a 

 movable bracket, is made to rotate, and is provided at 

 its edge with several sockets, of which three are shown, 

 for what we now term stage forceps, by which the 

 various parts of the object under dissection are drawn 

 asunder and fixed, while by rotation of the stage the 

 preparation is turned into convenient positions for dis- 

 section. I do not find the ria-ht of Strauss-Durckheim 



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/L 



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to be regarded as the inventor of this rotating type of 

 stage anywhere disputed, and in the letter of Chevalier 

 quoted the writer makes the explicit statement that the 

 first microscope of the kind was constructed for him by 

 the optician Cauchoix before 1824, four years before the 

 publication of his work on the Coleoptera. 



In fig. 2, the compound microscope is rejiresented, and 

 as being m\ich more novel in form, it deserves a detailed 

 examination. The foot is round and weighted with lead, 

 jind carries a cylinder or drum of brass with an aperture 



