652 PROCEEDINGS OF THE AMERICAN ACADEMY. 



mineral species recorded in lists of Chester minerals are either found in 

 the schists which have a widespread occurrence in the town or in the 

 granites and quartz veins which intersect them ; they hence have no 

 genetic relationship with those minerals contained in the emery bed 

 and the associated amphibolite formation as a whole. 



Harvard University, 

 March, 1909. 



