ILLUSTRATIONS 



PLATES 



PAGE 



I. Demonstrating Phagocytosis of Various Bacteria as Observed in 



the Determination of the Opsonic Index Frontispiece 



II Graphic Portrayal of the "Wassermann Reaction/' Demonstrating 

 the Results in the Case to be Tested, the Positive Control, and 

 the Negative Control 125 



III. Von Pirquet's Cutaneous Tuberculin Test (Positive Reaction) . . 182 



IV. Luetin Cutaneous Reaction, Demonstrating the Papular Charac- 



ter of the Reaction on an Erythematous, Indurated Base 187 



V. Gonorrhoeal Allergic Reaction, Demonstrating the Papulo-erythe- 

 matous Cutaneous Response on the Third Day after the Intra- 

 dermic Injection of One Cubic Millimetre of a Killed Polyvalent 

 Suspension of Gonococci 189 



FIGURES 



FIG. 



1. Diagrammatic Representation of Structure of Different Antibodies 25 



2. Illustrative of Opsonic Curve, Showing Immunity of Rabbit 39 



3. Illustrative of Inoculations and Curve of Opsonic Indices Demon- 



strating Immunity of Ram 40 



4. Capillary Teat Pipette for Removal of Senun from Clotted Speci- 



men of Blood 74 



5. Widal's Test, Positive 78 



6. Widal's Test, Negative 78 



7. Method of Obtaining Blood from Sheep's Ear 105 



8. Showing Method of Intravenous Injection or Immunization of 



Rabbit 107 



9. Demonstrating Method of Obtaining Complement by Bleeding 



to Death an Anaesthetized Guinea-pig 109 



10. Titration of Antigen 113 



11. Showing Method of Collecting Blood from Vein of Arm with 



Keidel's Vacuum Ampoule 114 



12. Showing Authors' Method of Obtaining Blood for Complement- 



fixation Reactions 115 



13. Titration of Complement 119 



14. Showing Arrangement of Tubes in Performance of Wassermann 



Reaction on One Unknown Case, with Positive and Negative 



Controls 126 



ziii 



