An Act amending the act of June 2, 1915 (P. L. 736, No. 338), known as "The Pennsylvania Workmen's Compensation Act," further providing for contractors; further defining "occupational disease" and providing therefor; further providing for partial disability and specific loss; further providing for the running of periods of limitation for other procedural matters, for the rights of employees, and for certain attorney fees; imposing a tax upon the gross receipts of workers' compensation insurance carriers; establishing the Workers' Compensation Adjustment Fund; and making editorial changes.