Section 4. That the Responsible Head of Any Hospital or Public

institution, in which any experiment or operation of any kinds mentioned in Section 1 of this Act shall have been made, shall on or before the first day of February in each year make a written report, attested by oath, to the Commissioners of the District of Columbia of all such experiments and operations that shall have been made in such hospital or public institution during the calendar year next preceding, which report shall contain copies of the statements and of the consents required by said Section 1, together with detailed accounts of such experiments and operations and the results thereof; and such reports shall be printed annually.