NATIONAL DEBTS OF THE TWENTY LEAD. ING NATIONALITIES IN 1875.

Country.

France

England.

United States

2,125,000,000

Interest. Rates

$4,500,000,000 $165,000,000 3

3,900,000,000 133,500,000 21

103,000,000 43

TABLE.-Showing the number of Patents issued for each of the following mechanical devices since the organization of the U. S. Patent Office :

Bee-hives....

645

Bending-machines for wood and metal..

144

Boots and shoes, manufacture of, and articles used

Pavements...

404

Photography.

346

Planing-machines, wood and metal.
Propellers, and apparatus for......

Printing-presses, apparatus and material.

Railways, apparatus and connections....
Rotary engines...

384

570

756

1,552

170

From the Report of the U. S. Commissioner of Patents.