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POPULAR SCIENCE MONTHLY. 



were designed for the treatment of ores in economical quantities of 

 from five hundred pounds to three tons, and used entirely for purposes 

 of instruction. They are now known as the John Cummings labora- 

 tories, in memory of one who for many years was treasurer of the 

 Institute and one of its most devoted friends. They now occupy the 

 entire basement of the Eogers Building, and include laboratories for 

 milling, concentrating and smelting ores, as well as for testing them by 

 assay and by blowpipe. The development of these laboratories from the 



Three Stamp Mii.i. in Mining Laboratory. 



small beginnings of 1871 has been mainly due to the efforts of Prof. 

 E. H. Eichards, past president of the American Institute of Mining 

 Engineers, whose contributions on methods of ore dressing are well 

 known to mining engineers. The staff of this department also includes 

 Prof. H. 0. Hofman, well known for his researches in metallurgy. 



Mention should here be made of the department of geology, which 

 is under the direction of Professors Niles, Crosby and Barton, and 

 which now occupies commodious quarters comprising the greater part 



