THE JOURNAL OF IMMUNOLOGY Vol. XXVI MARCH, 1934 No. 3 PUBLISHED MONTHLY BY THE AMERICAN ASSOCIATION OF IMMUNOLOGISTS ADVISORY BOARD SIMON FLEXNER ROBERT MUIR THEOBALD SMITH New York, N. Y. Glasgow, Scotland Princeton, N. J. LUDVIG HEKTOEN G. H. F. NUTTALL F. G. NovY Chicago, Ill. Cambridge, England Ann Arbor, Mich. KARL LANDSTEINER WILLIAM H. PARK WILLIAM H. WELCH New York, N. Y. New York, N. Y. Baltimore, Md. A. E. WRIGHT London, England CONTENTS FRANK ~{ALTANER. A Study of "Smooth" and "Rough" Forms of the Typhoid Bacillus in Relation to Prophylactic Vaccina- tion and Immunity in Typhoid Fever ..................... 161 WILLIAM I~. TALIAFERRO AND LUCY GRAVES TALIAFERRO. Com- plement Fixation, Precipitin, Adhesion, Mercuric Chloride and Wassermann Tests in Equine Trypanosomiasis of Panama (Murrina) .............................................. 193 LEON BUCHBINDER. A New Heterophile Antigen Common to Avian Erythrocytes and Some Varieties of Genus Pasteurella; Its Significance in the Classification of Birds ................ 215 FLORENCE GRAM. Pneumococcus Leucocidin .................. 233 THE WILLIAMS & WILKINS COMPANY BALTIMORE, U. S. A. Made in United Stales of America THE JOURNAL OF IMMUNOLOGY EDITED BY ARTHUR F COCA AND JOHN C. TORREY BOARD OF EDITORS J. F. ANDmRSON DENNIS EMBLETON W. H. MANWARING New Brunswick, N. J. London, England Lcland Stanford Jr. Univ, JOHN A~rER L. W. FAMULENER J. MClNTOSH St. Louis St. Luke's Htmpital, N. Y. London, England A. BREINL Townsvillc, Quoclmland. J. G. FITZGERALD C. J. MARTIN Australia University of Toronto London, England J, BRONFENBRENNIIR WILLIAM W. FORD M. J. ROSENAU St. Louis Johns Hopkins University Harvard Univemity C. H. BROWNINO Glasgow, Scotland F. P. GAY J. HENDERSON SMITH WILLIAM BULLOCH Coll. of Phys. & Surg., N. Y. London, England London, England J. W. JOBLING R. P. STRONG RUFus I. COL1 Coll. of Phys. & Surg., N. Y. Harvard University Rockefeller InsUtute H. R. D~A~ JOaN A, KOLMER F. H. TEALE University of Cambridge, University of Pennsylvania London, England Cambridge, Enghnd PRESTON I~Y]~S H. G. WELLS GIBORGES DRZTER University of Chicago Oxford, England University of Chicago WILLIAM J. ELSmR J. C. G. LEDINGHAM HANS ZINSSER Cornell University London, England Harvard University THE AMERICAN ASSOCIATION OF IMMUNOLOGISTS OFFICERS AND COUNCIL PAST PRESIDENTS Dr. Thomas M. Rivers, Pres/den$ Rockefeller Institute, Dr. James W. Jobling 66th Street and York Avenue, Dr. John A. Kolmer New York City Dr. William H. Park Dr. Arthur F. Coca, Sec'y-Tre,as. Dr. G. W. McCoy Pearl River Dr. Rufus I. Cole New York Dr. Hans Zinsser Dr. Richard Weft Dr. A. B. Wadsworth Dr. Frederick P. Gay Dr. A. R. Dochez Dr. F. G. Novy Dr. Arthur F. Coca Dr. H. Gideon Wells Dr. Stanhope Bayne-Jones Dr. W.H. Manwaring Dr. Oswald T. Avery Dr. Ludvig Hektoen Dr. Eugene L. epic Dr. Karl Landsteiner Entered a8 ~cond-~lw matter February 21, 1916, at the Post OtBce at Baltimore, Maryland, under the act of March 3, 18~. Copyright, 1934, by Tim WiUiaum& Wflkins Compauy .