GLOSSARY 351 



Bacterin. — A suspension of bacteria prepared for therapeu- 

 tic purposes. 



Bacteriocidin. — Substance in the blood-serum, capable of 

 destroying bacteria. 



Bacteriolysin. — Specific antibody of third order of Ehrlich, 

 concerned in the dissolution of bacteria. 



Bordet-Gengou Phenomenon. — Complement-fixation reaction 

 as first applied to infection with cholera spirilla. 



Complement. — Non-specific substance normally present in 

 all blood-serum, acting in conjunction with antibodies 

 of third order of Ehrlich. 



Complement-fixation. — The using up, and rendering unavail- 

 able for further use, of complement, in the reaction be- 

 tween antigens and their specific antibodies (ambo- 

 ceptors). 



Cytolysin. — Specific antibody of third order, capable of dis- 

 solving foreign cells. 



Endotoxin. — Toxin bound up in the bacterial protoplasm, 

 and only set free by disintegration of the bacteria. 



Hcemolysin. — Specific antibody of the third order of Ehrlich, 

 capable of disintegrating foreign red blood-cells. 



Hcemolysis. — Disintegration of red blood-cells, setting free 

 the haemoglobin. 



Hoemolytic Amboceptor. — Synonymous with hgemolysin. 



Immunity. — The resistance manifested by man and various 

 animal species to infectious microorganisms or other 

 foreign proteins. 



Immunization. — The process by which the state of immunity 

 is attained. It comprises two forms, active and passive. 



Lysins. — Specific antibodies of third order of Ehrlich, com- 

 prising cytolysins, haemolysins, bacteriolysins, etc. 



Opsonic Index, — Measure of the ratio of the phagocytic 

 activity of neutral washed leucocytes in the patient's 



