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right was repealed, and a more complete and carefully-drawn law substituted.

In the preparation of Part II the author has freely availed himself of the publications of the British Patent Office and the standard European authorities. In preparing those portions of the work which relate to the practice of obtaining patents in the United States, he has been greatly indebted to the labors of the late able Commissioner of Patents, Mr. S. S. FISHER, many of whose decisions he has given in extenso. The author is also under obligations to other officers of the Patent Office, as well as to members of the bench and bar of the District of Columbia, for valuable assistance and timely counsel, which he desires most sincerely to acknow. ledge.

CHARLES S. WHITMAN.

529 SEVENTH STREET, WASHINGTON, D. C.,

January 4, 1871.

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