I shall never forget the afternoon when first I stumbled upon the half-hidden house of death. It was in midsummer, when the alchemy of nature transmutes the sylvan landscape to one vivid and almost homogeneous mass of green; when the senses are well-nigh intoxicated with the surging seas of moist verdure and the subtly indefinable odors of the soil and the vegetation. In such surroundings the mind loses its perspective; time and space become trivial and unreal, and echoes of a forgotten prehistoric past beat insistently upon the enthralled consciousness.