This book is a bicentenary volume of papers dealing with paralysis agitans, and it incorporates Parkinson's original essay on the shaking palsy. Parkinson wrote with clarity, modesty, and simplicity. In setting forth his subject matter he followed Lewis Carroll's injunction: "Begin at the beginning, and go on till you come to the end; then stop." Parkinson's prose, consequently, is easy to read and refreshing. This book also includes an engaging biographical essay on the man, an account of the changing views up to the present of the pathology of paralysis agitans, and a section on its clinical features with special reference to the relevant fundamental physiological issues. All this makes for informative, interesting reading.