Opinion by
Appellants constitute the present school hoard of the school district of McKees Rocks in Allegheny county. Their immediate predecessors purchased at a cost of $17,500 a lot of ground on which to erect a new and additional school building. In preparing the ground for the proposed new building, laying the foundation, and erecting the superstructure to the height of the first floor, they expended of the public money the further sum of $52,000, making in all an expenditure of about $70,000. The building has remained in that unfinished condition. Appellants now propose to abandon the site so chosen and improved, purchase another at a cost of $27,000, and erect thereon a school building estimated to cost when completed $125,000. The appellees, tax payers of the district, filed their bill complaining of this proposed action and asking that the board be restrained from carrying out their purpose. In the answer filed appellants seek to justify their action by the following considerations: first, that it is doubtful whether the foundations constructed on the present site are sufficient to support the contemplated structure, second, that to complete the building on which work has been begun, would open the door for claims now pending, or which may be made, for work and material employed and furnished in and about the