H. H. Holmes (or, to call him by his real name, Herman Webster Mudgett), a qualified practitioner of medicine, whose extraordinary career of crime attracted world-wide attention and has caused his name to be coupled with that of Wainewright, was during the last days before his execution carefully studied by Professor Arthur MacDonald and Dr. E. S. Talbot (MacDonald, “Criminological Studies,” Report of the Commissioner of Education, Washington, 1896; Talbot, “H. H. Holmes,” Journal of the American Medical Association, Aug. 1, 1896). The case is one of so much importance that it is worth while to summarise the reports of these two experienced investigators.