42 The Microscope. 



When the slide is cooled off, clean awa}^ the excess of balsam 

 w.ith alcohol or benzol, and finish to suit the taste or to corres- 

 pond with other cabinet slides. 



Meteoric rocks, granites, gold, silver and copper specimens, 

 in fiict any mineral, can be made into a beautiful and valuable 

 slide for study in this way. 



BOTANICAL DISSECTING MICROSCOPE. 



J. ZENTMAYER. 



The instrument was designed and constructed to meet the 

 requirements of Prof. J. T. Rothrock, of the University of Penn- 

 sylvania, in his botanical class. It is made of polished brass, 



and consists of a circular base five inches in diameter, to which 

 is fastened a stout pillar which carries the broad stage (four by 

 five inches), provided with spring clips, which can be removed 



