768 FEW YOEK STATE MUSEUM 



does not pay to work it for any purpose requiring large quantities 

 of raw material. 



It seems curious that tlie sole application of this material which 

 usually suggests itself is for the manufacture of Portland cement, 

 and, while this is indeed an important application, still it is only 

 worthy of consideration in the case of very large deposits, that 

 is, those not less than 6 feet thick and of at least 100 acres area, 

 while deposits smaller than this are open to nearly all the uses to 

 which limestone can be pu.t. 



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