I must advise you to be on your guard against the Indians, the best of whom will murder a man for a trifle, if they can meet him alone, or off his guard.
"A Mr.Nabb, a few months ago, brought me some white metal, which, he says, he smelted in a common forge--it was as bright as silver, but too hard to bear the hammer.

I think it must be zinc." _March 18th_ .-- Mr.Amos Eaton writes from Troy: "A second edition of my _Index to Geology_ is in the press--about thirty-six pages struck off.

I have written the whole over anew, and extended it to about two hundred and fifty pages 12mo.

I have taken great pains to collect facts, in this district, during the two years since my first edition was published.

But I am rather deficient in my knowledge of secondary and alluvial formations; I wish to trouble you with a few inquiries upon that subject.
"From what knowledge I have been able to obtain in that department, I am inclined to arrange the secondary class thus:-- "Breccia: compact, or shell limestone; gypsum, secondary sandstone.
"I leave much, also, for peculiar local formations.
"A gentleman presented specimens to the Troy Lyceum, from Illinois, of gypsum and secondary sandstone, and informed me that the latter overlaid the former in regular structure.