Chap. 0546 An Act to approve the acquisition by the united states of a tract of land in the city of boston. Be it enacted, etc., as follows: Section 1. The consent of the commonwealth is hereby granted to the United States of America to acquire by purchase or by condemnation lands situated in the city of Boston lying on the northerly side of Boston harbor, in that part of Boston known as East Boston, containing about three acres, to be described in a plan or plans to be approved by the harbor and land commissioners, and to be used for the purposes of an immigration station and for other purposes of the department of commerce and labor of the United States government. Section 2. Jurisdiction over the area so to be acquired is hereby granted and ceded to the United States: 'provided, always, that the commonwealth shall retain concurrent jurisdiction with the United States in and over the area so acquired, so far that all civil and criminal processes issuing under the authority of the commonwealth may be executed on said land and in any buildings now or hereafter thereon, in the same manner as if jurisdiction had not been granted as aforesaid; and provided, also, that the exclusive jurisdiction shall revert to and revest in the commonwealth whenever the area so acquired shall cease to be used for the purposes mentioned in section one hereof. Section 3. The commonwealth hereby cedes to the United States of America all tide water lands belonging to the commonwealth within the area to be acquired as aforesaid, and hereby grants to the United States the exclusive use and occupation thereof, together with the right to fill and dredge thereon, and to erect and maintain any and all structures thereon: provided, however, that the same shall revert to and revest in the commonwealth whenever the said lands shall cease to be used for the purposes set forth in this act. Section 4. This act shall be void unless plans of the land acquired under the provisions of this act, and approved by the harbor and land commissioners, shall be deposited in the office of the secretary of the commonwealth within one year after the date of the acquisition.