84: GEOLOGY OF SOIL. 



limestone is to be retained. Other soils have this element 

 included in the result of their analyses; and it is with the 

 like exceptions, as liable to be there misplaced as in the soils 

 of Massachusetts. Retaining, therefore, all the lime, a still 

 wider examination will show the great uniformity in chem- 

 ical composition of all soil. 



The results may be tabulated as follows, dividing, as has 

 been explained, all soil into insoluble, soluble, and forms of 

 'lime. The soluble includes clay, iron, magnesia, the forms 

 of lime, plaster, bone-dust and limestone. 



