This textbook introduces details of pharmacognosy. Chapter 1 introduces pharmacognosy. chapter 2 details on classification of drugs. Chapter 3 describes adulteration and evaluation of drug. Chapter 4 details on occurrence , distribution , isolation , identification tests and pharmaceutical applications of alkaloids , terpenoids , glycoside , volatile oils, tannins and resins . Chapter 5 (a.b and c) have details on crude drugs . Chapter 6 and 7 explains plant fibres as surgical dressings and traditional system of medicine economy and herbs as food . Chapter 10 and 11 discuss on herbal formation and herbal cosmetic. Unit 12 covers the details onn phytochemical investigation of drugs.