Geology and Mineralogy. 823 
are comparable, having been obtained under similar conditions. 
The other series of results which are given do not differ greatly 
State of science no certain conclusions can be reached in regard to 
the validity of Prout’s law or of other numerical relations between 
the atomic weight of the chemical elements. 
Il. GEoLoGyY AND MINERALOGY. 
1, Occurrence of Fossiliferous Tertiary Rocks on the Grand Bank 
and George’s Bank ; Verritt.—Among the 
ant results of the investigations made by the party connected with 
the U. S. Fish Commission, stationed at Gloucester, Mass., during 
is the discovery of fragments of a hitherto 
more or less abundance fossil shells, fragments gnite, 
one case a spatangoid sea-urchin. Probably nearly one-half of the 
Species are northern forms, still living on the New England coast, 
k 
r From 
dozen fossiliferous fragments have been obtained, containing more 
than twenty-five distinct species of shells. ong these one of 
the most abundant is a large thick bivalve (Jsocardia) much 
resembling Cyprina islandica in torm, but differing in the struct- 
