This book begins, after preliminary chapters on the approach to case taking and the rationale behind a classification-based study of natural sources of homoeopathic remedies, with a general introduction to the animal kingdom, and an introduction to the phylum Mollusca. Then follow sections on each of three classes of molluscs Bivalvia, Gastropoda and Cephalopoda. Towards the end, the learning in the book is encapsulated in the Summary of Mollusca. Similarly, each section begins with an introduction to the general class, followed by chapters on a few sub-groups of that class. It ends with a summary of the class. Within each chapter are presented first the general information about a sub-group in the class, and then a description of some species in the group. This is followed by homoeopathic information available about remedies made from those species and then by cases where possible. This is followed by a summary of the main features of the group. The last page of every chapter contains an overview of possible source words of that group, titled Expressions of (that group) in the Patient. Hence the Book gives an overview of the Phylum Mollusca. The Section gives an overview of a Class within the above phylum. The Chapter gives an overview of a Sub-group within the class. Possibly significant source words are highlighted throughout the descriptive text in the book. Dr. Rajan Sankaran is at the forefront of the evolution of the Kingdom approach in Homoeopathy. This is a new way of case taking with an emphasis on going to the sensation level in the patient where one can hear the language of the source. Concurrently,a parallel approach evolved to study the Homoeopathic Materia Medica in terms of kingdoms and then to see how each individual remedy reflects the qualities of its natural order. All this has resulted in an exponential expansion of the homoeopathic horizon. Used increasingly by practitioners, this new approach called for a body of work that could be referred to once the patient has expressed his deepest sensation. Needed were books that presented the Materia Medica with the kingdom approach i.e. a look at the various natural orders, their common qualities in nature, the sub-divisions, the recognition of the alert or the source words of each order and then how to differentiate further. Dr. Sankaran has already presented the profession with his An Insight Into Plants (3 Volumes) and then his experiences with the mineral kingdom in the two volumes of Structure. The exploration of the animal kingdom will be laid out in several volumes of the Survival series. This series is co-authored by Dr. Sudhir Baldota, assisted by many editors, and has contributions from several homoeopaths experienced in the Sensation method. Mollusca is the first of this series. Within are described the qualities of Mollusca in nature, three of its sub-divisions - Bivalvia (oysters, clams...), Gastropoda (limpets, snails...) and Cephalopoda (octopuses, cuttle fish...) and expressions these in the human being. Each of these is described with source words, proving information and clinical cases so as to see the whole map and thus make it easy to recognize it in clinical practice.