The Commissioner of Revenue Services may prescribe regulations and make rulings, not inconsistent with law, to carry into effect the provisions of sections 12-204, 12-204c to 12-204g, inclusive, 12-212, and 12-212a, which regulations or rulings, when reasonably designed to carry out the intent and purpose of said sections, shall be prima facie evidence of its proper interpretation. The commissioner shall, from time to time, publish for distribution all regulations prescribed hereunder, including any of such rulings which appear to him to be of general interest.