This book is a compilation of specific techniques used in understanding the basic principles of Pharmacology and also the evaluation of potential drugs.A book which stresses a practical and applied approach to biological evaluation techniques. Step-by-step procedures for the identification of unknown compounds for specific pharmacological activity are given in a lucid manner. This gives an opportunity to the investigators to carry out screening procedures of compounds of either known or unknown pharmacological activity. The experiments on bioassay have been written in such a way that a student can perform 25 different experiments on this topic.