I mention it, because you may, in your travels, be able to see it.

He says it covers an acre or more to a great depth, is burned into excellent lime with great ease, and is very valuable, as no good limestone is found near them.

Some of it is very soft, like agaric mineral, and would be so called, were it not associated with beautiful tufa of a harder kind." _Geology of America_.--"You have explored in fine situations, to extend the knowledge of the geology of our country, and have made great discoveries.

I congratulate you on what you have been able to do; I hope you may be able, if you wish it, to add still more to our knowledge." _Jan.29th_.

Mr.McNabb says: "I have just received a specimen of excellent pit-coal from Tioga county, Pennsylvania, near the head of the south branch of the Tioga River, and about twenty miles south from Painted Post, in Steuben County.