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302 



APPENDIX 



tine filling a coral at Lake Chebogamong, and frag- 

 ments of corals at Melbourne, in Eastern Canada, 

 and to the similar mineral filling fossils in a 

 limestone from Llangwyllog, in Wales, and in that 

 of Maxville, Ohio. Hunt regarded all these as 

 coming essentially into the same category as regard 

 to general composition and properties. His analysis 

 of the minerals from Pole Hill and Llangwyllog is 

 as follows : — 



lOO'OO 



9989 



These minerals approach in composition to the 

 jollyte of Von Kobell, from which they differ in con- 

 taining a portion of alkalies, and only one half as 

 much water. In these respects they agree nearly 

 with the silicate found by Robert Hoffman, at 

 Raspenau, in Bohemia, where it occurs in thin 

 layers alternating with picrosmine, and surrounding 



