The first edition of this book, published in 1967, was a masterpiece of clarity with respect to the basic concepts and principles of Homoeopathy. Although the format and presentation have seen many changes in the subsequent editions, the author's original vision and objectives remain.This fourth edition, the first International edition, has been completely updated and revised. New information has been added with respect to the 'Study of Homoeopathic therapeutics' including Angina Pectoris, Myocardial Ischaemia, Haemorrhoids, etc and 'How to study Homoeopathic Materia Medica' with reference to Phosphorus and Mercury.