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 336 review, (3) to advise the respective governments of defects, (4) to arrange for future international conferences, (5) to make yearly report, (6) to exchange publications with other institutions, and (7) to act as cooperative agents for each of the governments concerned. The convention was to become effective (art. 10) on the establishment of one of the bureaus for such countries as should accede to the new convention, the other countries remaining bound by the former convention; and each of the bureaus was to be established (art. 11) as soon as two thirds of the countries in its own group should ratify the convention, and the first bureau established might act temporarily for the other countries. It was finally provided (art. 12) that Brazil should be the intermediary for exchange of ratifications.

The Rio convention of 1906 was ratified only by Guatemala (1907 and 1909), Salvador (1907), Nicaragua (1908) and Costa Rica (1908), and by Chile (1910); and it never became effective.

At the fourth Pan American conference, held at Buenos Aires in 1910, —twenty powers, including South American countries except Bolivia, being represented,— the fourth copyright convention was signed August 11, 1910. It undertakes to "acknowledge and protect the rights of literary and artistic property," and includes (art. 2) with dramatic and musical works those of a choregraphic character. It retains (art. 4) the definition of the scope of copyright. The provision as to the indicated author is continued (art. 5) in more precise language. It substitutes for the previous cumbrous method the simple provision (art. 3) "the acknowledgment of a copyright obtained in one State, in conformity with its laws, shall produce its effects of full right in all the other States without the necessity of complying with