340 RECENT CHANGES OF LEVEL. 



If this theory of the glacial depression be accepted we may obtain thereby a basis on 

 which to compute the I'igidity of the earth's crust as well as other important features con- 

 nected with those parts of the earth, which though quite close to the surface, are beyond 

 direct observation.^ 



'ThisTeport is meant to be preliminary to a more special and exhaustive study on the glacial and other dynamic phe- 

 nomena of the coast of Maine. 



