ADVERTISEMENTS. 



THE STURTEVANT MILL CO., 



88 MASON BUILDING, BOSTON, MASS., 



SOLE MANUFACTURERS 



STURTKVANX MILL, 



For Crushing and Pulverizing "PHOSPHATE ROCK" and all Hard 



Material. Simple, Effective, Economical, Used and Endorsed 



BY MANY Prominent Fertilizer Manufacturers. 



ALSO ROCK EMERY MILLSTONES. 



Superior to the Best French Buhr-Stones. 



IF YOU WISH 



Any device for regulating steam, write to the MASON REGU- 

 LATOR CO., of Boston, Mass. We also send, for 30 cents in 

 stamps, our little book, " Key to Steam Engineering," serviceable 

 to anyone in charge of a steam plant. 



AIR COMPRESSORS. 



THE NORWALK IRON WORKS CO., 



Circulars. SOUTH NORWALK, CONN. 



