The factors which help the antigen power of kephalin kolloidchemically and intensify the reaction were researched in this experiment.
1) Tinctura aurantii, T. digitalis and T. valerianae increased slightly the complement binding reaction of leprous serum.
2) Phenol-alcohol and chloric acid phenol alcohol increased it, especially the latter remarkablly.
3) In a group of cyclopentanoperhydrophenanthren compounds, ......chol acid, chol acid sodium, glycocol acid, cholestexin, and ergosterin......cholesterin and ergosterin intensified the reaction.
4) Vitellin strengthened the reaction, but showed non-specific reaction. Egg albumin, egg globulin and kasein didn't produce any increased reaction.
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