In the "Spirit", Rajan presented his concept of disease as delusion. Here, he shows how delusions can be classified using Hahnemann's theory of miasma. With numerous illustrative cases, he shows how this classification can be used as a map of disease to facilitate remedy selection. Next, a detailed study of homeopathic drugs with reference to their source reveals the purpose of the traditional classification into plant, animal and mineral kingdoms. The results of a detailed study of the periodic table are presented which whow the relation between chemistry and homoeopathy, underlining the scientific basis of homoeopathy. The mineral remedies are studied in detail and with cases, call forth-vivid images to mind. A number of recent drug provings conducted by Rajan in his seminars all over the world are included, which give a new insight into these drugs. After a study of some plant and animal remedies, there follows a differential analysis of drugs from the various kingdoms - this study will prove a landmark in the homoeophathic field. Finally. Man y original ideas on homoeopathic philosophy are expounded, chief among these being his thoughts on how and why organic pathology develops.