Months.

F.

Statement showing amount of fees received and number of applications and caveats filed during each month of the year 1851.

Table exhibiting the business of the office for the last eleven years, and the necessity of an increase of permanent clerical force.

The foregoing statistics exhibit a very large increase of business in this office for the last eleven years; and by reference to the table it will be seen that the increase for 1851 is in full proportion with former years. This accumulation of business has been provided for from time to time by Congress, in authorizing necessary additions to the examining force. This force for the present is deemed sufficient. But there are still departiments of the business and labor of the office which have increased in a corresponding ratio with the examinations, and no pro vision made by Congress to relieve them. Hence the suggestions in rela tion to an increase of clerical force, in the preceding pages.

Total patents..

State.

Patents, reissues, designs and additional improvements are all included in this table.

CLASSIFIED LIST OF PATENTS THAT HAVE EXPIRED IN THE YEAR 1851.

CLASS I.-Agriculture, including instruments and operations.

CLASS II.-Metallurgy and manufacture of metals.

IV.-Classified list of patents, &c.—Continued.

CLASS III.-Manufactures of fibrous and textile substances, including machines for preparing fibres of wool, cotton, silk, fur, paper, &c.

IV. Classified list of patents, &c.-Continued.

CLASS IV.-Chemical processes, manufactures, and compounds, including medicine, dying, color-making, distilling, soap and candle-making, mortars, cements, &c.

Composition, water-proof, for boots, Patrick G. Nagle...... Philadelphia, Pa..... Feb. 1