Prior to the special session of 1938 the enacting clause was different from that now in use and was incorporated as a part of the first section of the bill. In the Laws of Pennsylvania up to 1872, it was printed at length. From 1873 to 1937, only the abbreviation "Be it enacted, &c.," was printed. In amending the first section of 1937 and earlier acts, this abbreviation is always used, whether or not the old enacting clause appears in full in the printed statute.
101 Pa. Code § 15.226