II THE JOURNAL OF IMMUNOLOGY EDITED BY AaTHUR F. COCA AND JOHN C. TORREY BOARD OF EDITORS J. F. ANDERSON DENNIS EMBLETON W.H. ~{ANWARING New Brunswick, N.J. London, England Loland Stanford Jr. Univ. JOHN AUI,;R L.W. FAMULENER St. Loui, St. Luke'8 Hospital, N.Y. J" lt'{CINTOSlt A. BItEINI, J. ('~. FITZGERALD London, England TowtmviHe. Queoaslan,], University of Toronto C.J. ~ARTIN AuatralbL WILI,IAM W. FORD London. England J. }~~I{ONFI']N BRI']NNER Johrm Hopkins University Sty. Louis ~{" J, I~OSENAU C. H. BItOWNING F.P. GAY !Harvard University Gh~sgow. Scotland Coil.of Phys.& Surg., N.Y. J. HENDERSON SMITH ~VILLIAM I~ULI,OCI[ J. ~V. JOBBING London, England Londorl, ]':r|~]and Coll. of Phys. & Surg., N. Y. RUFUS J. COLE JOHN A. I{OLMER 1~,. P. STRONG Harvard University Rockefeller hmtitute University of Ponrmylvania It. R. ])EAN hllTSUJI KOSAKAI F.H. TEALE University of Cambridge, Sendai, Japan London, England Cambridge, England GEORGES DREYER PRESTONI(VES H.G. WELLS Oxford, England University of Chicago Univernity of Chicago WIImI,M J. ELSER J.C.G. LEDIN(]HAM HANS ZINSSER Cornell University London, England Harvard University THE AMERICAN ASSOCIATION OF IMMUNOLOGISTS OFFICERS AND COUNCIL Dr. Stanhope Bayne-Joncs, President PAST PRESIDENTS University of Rochester Medical School Dr. Gerald B. Webb Rochester, N.Y. Dr. James W. Jobling Dr. Arthur F. Coco, See'y-Treas. Dr. John A. Kolmer 8 West 16th Street Dr. William H. Park New York City Dr. G. W. McCoy Dr. Arthur F. Coco Dr. Rufus I. Cole Dr. Stanhope Bayne-Jones Dr. Hans Zinsser Dr. Oswald T. Avery Dr. Richard Well Dr. Eugene L. Opie Dr. Frederick P. Gay Dr. Karl Landsteiner Dr. F. G. Novy Dr. Ludvig Hektoen Dr. W. H. R{anwaring Entered as se¢ond-ch~ matter February 21, 1916, at the Post-O.qico at Baltimore, Maryland, under the act of March 3, 1879. Acceptance for mailing at special rate of postage provided for in Section II03, Aot of October 3, 1917. Authorized on August 16, 1918 Copyright, 1931, by The Williams & Wilkins Company .