Napier deduced an approximate formula for the outflow of steam into the atmosphere which checks closely with the figures just given.

The actual transfer rates in superheaters are affected by so many conditions that it has not so far been possible to evolve any formula of practical value.

4,294.—Apparatus for Pitching Barrels.—Louis Schulze, Baltimore, Md. Patent No. 106,964, dated August 30, 1870.

4,699.—Back of a Chair or Sofa.—George Unverzagt, Philadelphia, Pa.

Seeding Machine.—Lewis B. Myers and Henry A. Myers, Elmore, Ohio. Letters Patent No. 16,772, dated March 3, 1857.

The Scientific American will be delivered in every part of the city at $3.50 a year.

Engravings may head advertisements at the same rate per line, by measurement, as the letter-press.

The Circular Stocking Frame, from 2 in. to 5½ in. diameter. These circular frames, with my last improvements, are as near perfection as possible.

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