vi TABLE OF CONTENTS. 



Chapter Page 



X. On the Existence of Sensitizing Substances in the Majority of 



Antimicrobial Sera 217 



BORDET AND GENGOU. 



XI. On the Mode of Action of Cytolytic Sera; and on the Unity of the 



Alexin in a Given Serum 228 



Bordet. 



(From the Pasteur Institute of Brabant, Brussels.) 

 XII. On the Sensitizers of Sera Active against Albuminous Substances 241 



Gengou. 



XIII. On the Mode of Action of Antitoxins on Toxins 259 



Bordet. 



XIV. The Properties of Antisensitizers and the Chemical Theories of 



Immunity 280 



Bordet. 



XV. Researches on the Agglutination of Red Blood Cells by Chemical 

 Precipitates, and on the Suspension of Such Precipitates in 



Colloidal Media 312 



Gengou. 



XVI. Observations on the Single Nature of Hemolytic Immune Bodies 



and on the Existence of So-called " Complementoids " 333 



Gay. 



XVII. The Fixation of Alexins by Specific Serum Precipitates 346 



Gay. 



XVIII. Deviation of the Alexin in Hemolysis 357 



Gay. 



IX. On the Relations of Sensitizers to Alexin 363 



Bordet and Gay. 



XX. On the Nature of Opsonins 389 



Sleeswijk. 



XXI. Alexin Absorption and the Antagonistic Property of Normal Sera 398 



Bordet and Gay. 



XXII. A Contribution to the Study of Molecular Adhesion, with a con- 

 sideration of its Function in Various Biological Phenomena. . 414 



Gengou. 



