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POPULAR SCIENCE MONTHLY. 



Clemens Alexander Winkler. 



of science of the Freiberg Mining 

 Academy were his uncles, namely the 

 great engineer, Julius Weisbach, and 

 the renowned mineralogist, August 

 Breithaupt. The greatest practical 

 achievements of Winkler combine those 

 two fields of investigation, namely, 

 the manufacture of sulphuric acid by 

 the contact method, from the waste 

 gases of roasting ores, and the rapid 



and accurate analysis of furnace gases. 

 His treatise on volumetric analysis is 

 also specially excellent in its methods 

 of reduction. Both these works have 

 passed through three editions; his con- 

 tact method was awarded a grand 

 prize at the St. Louis World's Fair. 



The discovery of the element ger- 

 manium, by which Winkler has been 

 known best throughout the chemical 



