This book is a modest attempt to provide a simple text for those who desire to acquire knowledge of herbal standardization, qualitative phytochemical screening and antibacterial activity of herbal drugs. The authors have attempted to give as many illustrations as possible to make the concepts and principles clear to the reader. The large number of review material is incorporated to each chapter after exhaustive literature survey. We believe that this book will be certainly a help to all the students, researchers and faculty members.