entee, his legal
representatives, or the assignees of the entire interest, when, by
reason of a defective or insufficient specification, or by reason of the
patentee claiming as his invention or discovery more than he had a right
to claim as new, the original patent is inoperative or invalid, provided
the error has arisen from inadvertence, accident or mistake and without
any fraudulent or deceptive intention.

CAVEATS.--A caveat, under the patent law, is a notice given to the
office of the caveator's claim as inventor, in order to prevent the
grant of a patent to another for the same alleged invention upon an
application filed during the life of the caveat without notice to the
caveator.

Any citizen of the United States who has made a new invention or
discovery, and desires further time to mature the same, may, on payment
of a fee of $10, file in the Patent Office a caveat setting forth the
object and the distinguishing characteristics of the invention, and
praying protection of his right until he shall have matured his
invention. Such caveat shall be filed in the confidential archives of
the office and preserved in secrecy, and shall be operative for the term
of one year from the filing thereof.

An alien has the same privilege, if he has resided in the United States
one year next preceding the filing of his caveat, and has made oath of
his intention to become a citizen.

The caveat must comprise a specification, oath, and, when the nature of
the case admits of it, a drawing, and, like the application, must be
limited to a single invention or improvement.

FEES.--Fees must be paid in advance, and are as follows. On filing each
original application for a patent, $15. On issuing each original patent,
$20. In design cases: For three years and six months, $10: for seven
years, $15; for fourteen years, $30. On filing each caveat, $10.

On every application for the reissue of a patent, $30. Added to these
are the usual charges of patent solicitors for preparing the application
and for drawings etc.

SHAKESPEARE'S COUNSEL.

(Polonius' Advice to His Son Laertes.)

And these few precepts in thy memory
See thou character: Give thy thoughts no tongue.
Nor any unproportion'd thought his act.
Be thou familiar, but by no means vulgar.
Those friends thou hast, and their adoption tried,
Grapple them to thy soul with hooks of steel;
But do not dull thy palm with entertainment
Of each new-hatch'd, unfledged comrade.