I shall notice the work in a few days." _Geology of New York Island_.--"I wish you to give me an article on the mineralogy and geology of Manhattan Island, in the form of a letter purporting to be by a foreign traveler.

(See Appendix, No.

2.) It is my intention to give a series of letters, partly by myself and partly by others, which shall take notice of everything in and about the city which may be deemed interesting.

I wish to begin at the foundation by giving a geographical and geological sketch of the Island." _Indian Biography_.--"Colonel Haines also wishes you to unite with him and myself, in writing a series of sketches of celebrated Indians." Professor Silliman writes (Jan.

20th), acknowledging the receipt of a memoir on the fossil tree of the River Des Plaines, which was prepared for the American Geological Society.