In the winter of 1889-1890, the first Pan American conference was held in Washington, and at this a committee, of which Andrew Carnegie was the United States member, reported in favor of the adoption of the Montevideo convention. No action seems to have been taken, but it is probably this convention which is referred to as the first Pan American copyright treaty. The second Pan American copyright treaty, according to this numeration, was that adopted at the Pan American conference in Mexico City, signed January 27, 1902, at the same time with the patent and trade-mark treaty. This copyright convention was modeled somewhat on the lines of the Berne convention. At the Pan American conference in Rio de Janeiro, 1906, what is spoken of as the third Pan American copyright treaty, was adopted, and signed August 23, 1906, but this was really not so much a new treaty, as a supplementary convention providing for the development and regulation of international bureaus at Havana and Rio de Janeiro, and its provisions were never put into operation. A fourth Pan American copyright treaty, distinct from patent and trade-mark protection, was adopted at the Pan American conference at Buenos Aires in 1910 and signed August 11, 1910. The Mexico copyright convention was not ratified by the Senate of the United States until 1908 and was proclaimed by the President, April 9, 1908; the Rio convention has never been accepted by the United States; the Buenos Aires convention, replacing that of Mexico, was promptly approved by the U. S. Senate, February 16, 1911, but is yet to be acted upon by the other countries. {Sidenote: Mexico City conference, 1902} At the Pan American conference held in Mexico City in 1902, the second copyright convention was signed January 27, 1902, by representatives of Argentina, Bolivia, Colombia, Costa Rica, Chile, the Dominican Republic, Ecuador, Salvador, Guatemala, Haiti, Honduras, Mexico, Nicaragua, Paraguay, Peru, Uruguay and the United States, the delegates of Nicaragua, Paraguay and the United States acting _ad referendum_. {Sidenote: Mexico convention, 1902}