legislature shall be paid for the regular session commencing on the second Monday in January 1955, the sum of $600 annually, one-third on the second Monday in January, one-third on the second Monday in February, and one-third at the close of that session. Each member of the legislature who is away from the island of his residence shall also receive the sum of $10 per day for each day's attendance while the legislature is actually in session, in lieu of his expenses for subsistence, and shall be reimbursed for his actual travel expenses in going to and returning from each session, or period thereof, not to exceed a total of eight round trips during any calendar year. The salaries, per diem, and travel allowances of the members of the legislature shall be paid by the Government of the United States. (Limitations on holding other office) (f) No member of the legislature shall hold or be appointed to any office which has been created by the legislature, or the salary or emoluments of which have been increased, while he was a member, during the term for which he was elected, or during one year after the expiration of such term. {General powers; parliamentary rules) (g) The legislature shall be the sole judge of the elections and qualifications of its members, shall have and exercise all the authority and attributes, inherent in legislative assemblies, and shall have the power to institute and conduct investigations, issue subpoena [sic.] to witnesses and other parties concerned, and administer oaths. The rules of the Legislative Assembly of the Virgin Islands existing on the date of approval of this Act shall continue in force and effect for sessions of the legislature, except as inconsistent with this Act, until altered, amended, or repealed by the legislature. {Vacancies) (h) The Governor of the Virgin Islands shall fill any vacancy in the office of a member of the legislature by appointment. If the vacant office is that of a senator from a district, the person appointed shall be a resident of the district from which the member whose office is vacant was elected. If the vacant office is that of a senator at large the person appointed may be a resident of any part of the Virgin Islands. In any case, the person appointed shall serve for the remainder of the unexpired term. * 7. (Time, frequency, and duration of regular sessions; place of holding) (a) Regular sessions of the legislature shall be held annually, commencing on the second Monday in April, and shall continue in regular session for not more than sixty consecutive calendar days in any calendar year: Provided, however, That the