48 [Senate 



We have some quite large boulders, but they are not very abundant. I 

 saw some yesterday which would undoubtedly weigh twenty tons. All 

 these larger ones are Felspathic Granite, with large crystals of felspar in 

 a matrix of massive quartz, with very little mica. 



Of the specimens I send you, there is one of a peculiar kind, evidently 

 with an organic nucleus : one is from a mineral spring in our neighbor- 

 hood; and one is from a swamp, the earthy oxide of manganese, generally 

 known under the name of wad. 



I have not sent many besides these, from the rock in place. At some 



ether time, I may send one wholly made up from this. We have some 



scattering fragments of the old red sandstone on the tops of our hills. In 



the eastern towns of this county, it is sufficient to form quarries on the 



hill tops. 



Very respectfully, 



IRA SAYLES. 



BY PUKCHASE. 



A large slab of Medina Sandstone, covered with fragments of branches 

 of a fossil plant; ^rthrephycus harlani of Hall. See Palaeontology of 

 New-York, Vol. II, pa. 5, pi. 1, ff. 1; pi. 2, f. la, lb, Ic. 



Tooth of a Fossil Elephant. The locality from which it was obtained, 

 is not known. 



