Public buildings. Public buildings and grounds, hearings on H. 21070, to further regulate purchase of sites and erection of public buildings thereon, H. 21071, for protection of subcontractors and material men engaged in doing work of furnishing material for erection of Government buildings, H. 21072, for establishment of Bureau of Public Buildings [in lieu of Office of Supervising Architect], Jan. 25 and 26, 1915.