*From the Wards and Laboratories of the Hospital for Sick Children, and the Department of Pædiatrics, University of Toronto, under the direction of Alan Brown, M.D., F.R.C.P.(Lond.), and from the Connaught Laboratories, University of Toronto.
Read at the Seventy-third Annual Meeting of the Canadian Medical Association, Jasper Park, Alberta, June 19, 1942.