you please.

I supposed some months since that I had determined how far the greenstone extends above Deerfield and that pudding stone succeeded to it but from some circumstances I am inclined to think I have not. I have been so much engaged since you wrote that it was impossible for me to attend to it further. I have almost completed a geological map of the country for a dozen miles on each side of Connecticut river and from Northampton to Vermont on which I intended to put down the termination of the greenstone, and I had prepared an account of such geological and mineralogical facts as I have been able to obtain that have not been noticed in this section. I hope in two or three weeks to be able to complete the whole and if I suppose it would be of any service I would send it to you.

 I had almost despaired of being able to send you any specimens of Chabasie worth accepting, but having penetrated farther into the greenstone this afternoon I find it more pure, though I do not know that the specimens I send are scarcely worth accepting, since I have never seen any except that which I found in Deerfield. On any of the specimens I send you will find two forms of crystals, viz. one of them described by Cleaveland, a rhomb, and the other like the primitive form of the Staurolite, a right prism with rhomboidal bases. The angles of these rhombs are