NEW YORK, THURSDAY, SEPT. 4

A GUARANTEE

Whereas, Mr. RUFUS PORTER has commenced the publication of a scientific weekly paper, entitle the "Scientific American," and under apparently favourable circumstances; and whereas, the confidence of the public in new papers has become in some measure impaired, by the discontinuance of certain newspapers before the subscribers therefor had received the full value of the money advanced: now, therefore, Be it known to all whom it may concern, that we, the undersigned, do hereby guaranty the continuance of the publication of the "Scientific American" for the term of at least one year from its commencement.

Jonathan Richardson,

Wm. J. Spence,

William Foster

Certificate. - We are personally acquainted with the persons whose signatures are affixed to the foregoing guarantee, and believe them to be gentlemen of respectable standing and responsibility.

John Westall & Co.