COMPOSITION AND PROPERTIES OF NATURAL CEMENTS- 255 



TABLE 113. 



ANALYSES OF NATURAL CEMENTS, POTOMAC DISTRICT, MD. 

 (Average index, excluding No. 7, = 1 . 95.) 



TABLE 114. 

 ANALYSES OF MINNESOTA NATURAL CEMENTS. 



1. Mankato. C. Richardson, analyst. Brickbuilder, vol. 6, p. 229. 1897. 



2. Quoted by Cummings, "American Cements", p. 36. 



3. C. F. Sidener, analyst, llth Ann. Rep. Minnesota Geol. Survey, p. 179. 



4. Austin. Quoted by Cummings, " American Cements ", p. 36. 



5. " Tests of Metals at Watertown Arsenal, 1901. 



6. Mankato. " " 



