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CONTENTS

1. THE PATENT OFFICE-ITS ADMINISTRATION, &c.

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On the supervision exercised by the Secretary of the Interior. .......
Additional room required....
Increase of clerical force..
Librarian......
Patent Laws....
Judge of Appeals....
Analytical and descriptive Index of Inventions..
Chemical Apparatus for the use of the Office......
Reports of the Office illustrated......
International Exchanges.
Examiners' Reports...

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II. FINANCIAL AND STATISTICAL.

Receipts and Expenditures for 1851...........

21 Table exhibiting the business of the Office for the last eleven years..

24 Table showing the number of Patents, Re-issues, Designs, and Improvements granted in 1851.

25 Table showing the number of Patents issued to citizens of different States in 1851...... 25

III. CLASSIFIED LIST OF EXPIRED PATENTS.

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Classified List of Patents that have expired in the year 1851......

I.-Agriculture, including Implements and Operations..
II.-Metallurgy and Marufacture of Metals......
III.-Manufacture of Fibrous and Textile Substances..
IV.-Chemical Processes, Manufactures, and Compounds.

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V.-Calorifics, comprising Lamps, Fire-places, Stoves, &c...
VI.-Steam and Gas Engines....
VII.--Navigation and Maritime Implements...
VIII.-Mathematical, Philosophical, and Optical Instruments....

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