Part 12

_Answer_.--You have none except our well-known integrity in this respect, based upon a most extensive practice of thirty years' standing. Our clients are numbered by hundreds of thousands. They are to be found in every town and city in the Union. Please to make inquiry about us. Such a thing as the betrayal of a client's interests, when committed to our professional care, never has occurred, and is not likely to occur. All business and communications intrusted to us are kept _secret and confidential_.

Address MUNN & CO., Publishers of the SCIENTIFIC AMERICAN, 37 Park Row New York.

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THE "Scientific American" is printed with CHAS. ENEU JOHNSON & CO.'S INK. Tenth and Lombard Sts., Philadelphia, and 59 Gold St., New York.

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Transcriber's Note:

_x_ indicates italic script; =x= indicates bold script. ^ indicates superscript.

Some archaic (Early American) spellings have been retained.

Erata:

'irridescent' corrected to 'iridescent'. "Glass, iridescent" (Contents)

'monoply' corrected to 'monopoly'. "The cry of monopoly in this case is altogether unfounded,..." (Article 4: Progress of Petroleum)

'possesing' corrected to 'possessing'. "... possessing in every way the original form of the wood." (Article 42: Reduction of Nitrate of Silver by Means of Charcoal.)