84 



THE MICHOSCOPE. 



June, 



the edges seemed to touch but not over-lap. Around 

 this central mass were a few of the simpler forms. 

 With the polariscope sugar shows many brilliant colors. 

 To make a slide of tartrate of soda take a strong 

 solution of tartaric acid and neutralize it by the addition 

 of carbonate of soda. Spread this on a cover-glass and 

 warm but not boil. This must now be laid in a dry 

 place protected from the dust and in from two daj's to 



two weeks some of the slides will prove beautiful ob- 

 jects. Some never crystallize. The one shown above 

 polarizes so that on revolving the polariscope the colors 

 revolve around each center like so many wheels. 



Nitrate of uranium, in a solution of six parts water, 

 crystallizes in rhombic forms, but from a solution three 

 parts water containing much fine nitric acid it forms 



