54 



THE AMERICAN MONTHLY 



[Feb., 



sngg'est themselves more ])articulai'ly to the anatomist 

 as indispensible, have been supjiressed, such as tlu^ outer 

 tube for swinging the body to one side, and the numer- 

 ous sockets for stage forceps; and the rotating diaphragm 

 has been replaced by a tube moving vertically through 

 the opening in the stage, by the aid of a lever at the side, 

 so as to take from above the achromatic condenser of 

 Dnjardin patented at the same time, or a set of cylindri- 

 cal diaphragms, a feature of which Strauss-Durckheini 

 expressly objected as necessitating the disturbance of 



the preparation on the stage. A rack-and-pinion coarse- 

 adjustment has been added, and the milled head of the 

 fine-adjustment removed to the top of the pillar. 



This instrument came into great favor, much aided by 

 its cheapness, and the goodness of the objectives ; and 

 and was exhibited at the sitting of the Academie des 

 Sciences on February 13, 1837. 



On the occasion of Nachet exhil)iting at the Academie 

 des Sciences an apparatus for oblique illumination by 

 means of a prism on June 14, 1847, ten years later, 

 Oberhaeuser, now in the bitsiness by himself, announced 



