Under the products of intellectual labors are included, (1) patents; (2) copyrights; (3) letters, and (4) lectures.

(1) and (2) Patents and copyrights are treated elsewhere in this volume.6

(3) Where a letter is written and sent by one person to another, the right of property in the letter as a tangible piece of property is in the party receiving it, while the right of property in the letter as an intellectual production is in the writer. The receiver of a letter has no right to publish it, without the consent of the writer, unless such publication is necessary for the defense of the party receiving it.

4 Putnam vs. Wiley, 8 Johns, 432;

Stewart vs. Bell, 33 Miss., 154.

5 Smith on Personal Property, 341.

6 Patents, Subject 15, Copyrights, Subject 16.

(4) Lectures are a product of intellectual labor. The party who composed them has a property right in them and they cannot be published without his consent.