Sources of the Coiisfititciits of Minnesota Soils. 403 



building. But in the breaking- up of these rocks into farming- 

 soils so much is soluble that only a small part remains behind for 

 soil building, and this is largely the impurities of the rock, such 

 as silica and alumina ; while the other constituents, lime, mag- 

 nesia, soda, sulphur and phosphorus remain behind in small 

 quantities. 



XXVIII. Compact dolomite, Dresbach ; analysis by C. S. 

 Chappel. 



XXIX. Compact dolomite, Nininger ; analysis by Mary E. 

 Bassett. 



XXX. Dolomite, bottom layer quarried at Mankato ; anal- 

 ysis by C. L. Herron. 



XXXI. Dolomite, buff-colored Kasota stone, Kasota ; anal- 

 ysis by H. C. Carel. 



XXXII. Dolomite, porous, Frontenac quarries; analysis by 

 J. G. Cross and E. P. Sheldon. 



XXXIII. The buff limestone, Minneapolis, analyzed -as a 

 whole ; analysis by Professor J. A. Dodge. 



XXXIV. The buff" limestone, Minneapolis ; analysis by W. 

 A. Beach. 



XXXV. ''Galena limestone". Section 9, Spring Valley. 

 Chemist unknown. 



XXXVI. Mankato cement rock, Mankato, Minn. ; analysis 

 by W. C. Smith. 



XXXVII. Frontenac dolomite, quarried extensively as a 

 building stone, Frontenac, Minn. ; analysis by E. P. Sheldon. 



XXXVIII. Siliceous dolomite, Goodhue co. ; analysis by 

 G. A. X'. King. Results as reported have been recalculated. 



