It is a collection given by Dr. Close at the New York Homoeopathic Medical College from 1909-1913. No clearer exposition of the underlying principles of homeopathic philosophy exists then can be found in Stuart Closes "The Genius of Homeopathy". Of particular importance are the sections on case taking and the nature of symptoms. These essays are as relevant now as when first penned. This is a 20th century perspective on health, disease, susceptibility, posology, and other important homeopathic ideas.