TO CORRESPONDENTS.
Twelve copies of every original communication, published in this Journal, are if requested at the disposal of the author. Any larger number of copies will be furnished at cost. Authors should always specify at the head of their MSS. the number of extra copies they may wish to have printed; it is too late after the forms are broken up.
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Notice always to be given when communications sent to this Journal, have been, or are to be, published also in other Journals.
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The American Journal of Science, Second Series, which was commenced in January, 1846, is published on the 1st of January, March, May, July, September, and November, of each year, in Nos. of 152 pages each, making Two Volumes a year, fully illustrated by Engravings, and containing a comprehensive bulletin of Scientific Intelligence, Subscriptions $5 per year, in advance* Remittances should be forwarded to B. Silliman, New Haven, Conn.
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henry Whipple, Salem; Tucker & Ruggles, Worcester;
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April, 1849.
