An Act amending the act of December 5, 1936 (2nd Sp.Sess., 1937 P.L.2897, No.1), known as the Unemployment Compensation Law, in preliminary provisions, further providing for the definitions of "base year," "credit week" and "employer"; in contributions by employers and employees, providing for supplemental contributions by employees and further providing for reciprocal agreements; and, in compensation, further providing or qualifications required to secure compensation and for rate and amount of compensation.