RAW MATERIAL: NATURAL-CEMENT ROCK. 



211 



TABLE 97. 

 ANALYSES OF NATURAL-CEMENT ROCK, NORTH DAKOTA. 





TABLE 98. 

 ANALYSES OF NATURAL-CEMENT ROCKS, OHIO. 



1. Defiance. J. E. Whitfield, analyst. Bull. U. S. Geol. Survey No. 55, p. 80. 



2. Defiance. R. C. Kedzie, analyst. Cement Directory. 



3. Bellaire. N. W. Lord, analyst. Repts. Ohio Geol. Surv., vol. 6, p. 673. 

 . 4. Warnock. Wormley, analyst. Rept. Ohio Geol. Surv., 1870, p. 451. 



5. New Lisbon. N. W. Lord, analyst. Rept. Ohio Geol. Surv., vol. 6, p. 673. 



necessary to say that Nos. 1 and 3 are absolutely unfit for such use. 

 No. 2, on the other hand, is quite satisfactory. I regret that these 

 very untrustworthy analyses are, at present, the only ones available. 

 Texas. The second analysis on p. 212 has been published * as repre- 

 senting the average of the material used in making natural cement by a 



* 22d Ann. Rept. U. S. Geol. Survey, pt. 3. p. 737. 



