Any such school established shall be established on the Cottage Home plan, and the buildings thereof shall be substantially constructed, and adequately lighted, and ventilated, and provided with baths, playrooms, sleeping rooms, and kitchens; and there shall be adequate provisions for playgrounds, as well as provisions for instruction in the common branches, and for manual, domestic, and moral training, to the end that said schools shall, as far as possible during the period of detention, adequately provide for the mental, moral, and physical welfare and advancement of the children therein detained, and in order that said schools may be supplementary to the public school system of the Commonwealth.
11 P.S. § 375