The Board of Education had no authority to appropriate Hamilton Square, or any portion thereof, as a site for the proposed high school. The purposes for which the public squares may be used are those defined by positive law, and the erection of school-houses thereon is not one of these purposes. The resolution of the Board of Supervisors assuming to authorize the Board of Education to appropriate *420a portion of this square for that purpose, though passed in due form, was inoperative, because the Board had no authority to devote a public square to that purpose.

The contract of the Board of Education, upon which the suit is founded, was consequently %Htra vires in the extreme sense, and the plaintiff could derive no rights thereunder, since he was bound to take notice that the Board of Education could not, under any circumstances, acquire a right to occupy a public square for school purposes,

Order granting a new trial affirmed.