This work on Materia Medica is the result of conscientious labour, which has its origin in our bygone Student days when as alumni of our respective homoeopathic colleges, we used to sincerely learn homoeopathy at the feet of our gurus like Dr. Kasad, Dr. Sarabhai Kapadia, Dr. K.P.S. Bakshi, Dr. B.N. Chakravarty. The principle of differentiation and assimilation then imbibed in us by these expounders has been of the greatest importance in this work. We will consider ourselves satisfied if we in turn can impress on students and practitioners on this side of the hemisphere the essential importance of this most pivotal principle of the true science of the healing art.