€80 KEW YORK STATE MUSEUM 



9 Trass, from the Rhine valley 



10 Buffalo hydraulic cement, Buffalo, N. Y. 



11 Utiea, 111. 



12 Milwaukee, Wis. 



13 " Fern leaf " brand, Louisville, Ky, 



14 " Hulme," Louisville, Ky. 



15 N. L. & C. CO., Rosendale, N. Y. . , 



16 "Rock lock" « 



17 "N.Y.&R." " 



18 "Hoffman" " 

 ] 9 Norton high falls « 



20 Cumberland, Md. 



21 Napanee, Ont. 



22 " Newman," Akron, N. Y. 



23 "Cummings" 



24 South Riverside, Cal. 



25 " Brockett," Fort Scott hydraulic, Kansas City, Mo. 

 2G Utica brand, Utica, 111. 



27 Shepherdstown, W. Va. 



28 Howard hydraulic cement, Cement, Ga. 



29 Hydraulic cement rock on Platte river. Neb. 



30 Mankato, Minn. 



31 Cement rock, near Salt Lake City, U. 



32 St Louis hydraulic cement, near E, Carondelet, 111. 



33 Barnesville, O. 



34 Warnock, O. 



35 Austin, Minn. 



36 Blacksburg, S. C, cement rock. 



37 Round Top cement, Hancock, Md. 



38 Balcony Falls, Va. 



The Rosendale region of N^ew York is one of the best pro- 

 ducers of natural cement (of the dolomitic type) in this country, 

 but hydraulic limestone is found more or less in many states, spe- 

 cially those of the Appalachian region of the east. Others occur 

 in the west and in the region of the Great lakes. Some idea may 

 be gained of the extent of this industry at the present day by 

 stating that the works for making natural hydraulic cements are 

 found in jSTew York, Pennsylvania, Maryland, Virginia, West 

 Virginia, Ohio, Illinois, Kentucky, Minnesota, Kansas, Utah, 

 !N^ew Mexico, Wisconsin and Texas. According to the United 

 States geological survey, there were 76 plants in operation in 

 1899, which produced 9,868,179 barrels of natural cement, worth 



