This document discusses various physical parameters and methods used to evaluate crude drugs, including ash values, swelling factor, extractive values, and bioassay. It describes determining total ash value, acid insoluble ash value, sulphated ash value, and water soluble ash value. Methods are provided for measuring swelling factor and water soluble, alcohol soluble, and ether soluble extractive values. Finally, it outlines using bioassay to evaluate drug activity through tests on living organisms.