For mining, wrecking, pumping, drainage, and irrigating machinery, see advertisement of Andrews' Patents in another column.

The decision of the Board of Examiners-in-Chief is reversed, and priority awarded to Dickson.

Will it take more power to run two millstones in opposite directions than it will to run one at the same speed, the other being stationary?

You will find further information on the subject of transmitting power by compressed air, in our editorial columns of last week.

Our appearance at Philadelphia has drawn the attention of American manufacturers to us in a most marked and unexpected degree.

The North Pole itself is only shrouded in perfect blackness from November 13 to January 29, a period of seventy-seven days.

Carriage Wheels.—James D. Sarven, New Haven, Conn., has petitioned for an extension of the above patent. Day of hearing May 24, 1871.

One peculiarity is alone common to them and man, and this is the habit of lying upon the back in sleep.

The Arctic was afterward run into by a French vessel at sea and only a few of her passengers were saved.

Inquiries relating to patents, or to the patentability of inventions, assignments, etc., will not be published here.