GLOSSARY. 



THE meaning of many words occurring several 

 times in the text is given here that the reader may the 

 more intelligently follow the subject matter. Certain 

 unusual terms used seldom and sufficiently explained 

 under special headings are not repeated here. Nearly 

 all words in scientific language are derived from Latin 

 or Greek roots and are to be pronounced precisely 

 as printed. 



Aerobic Preferring or demanding atmospheric oxygen 

 for life. 



Agglutinins Substances in the serum capable of clumping 

 bacteria. Related words: to agglutinate, agglutination. 



Anaerobic Preferring or demanding the absence of 

 atmospheric oxygen for life. 



Anaphylaxis A condition of high sensitivity due to idio- 

 syncrasy to or previous injection with certain organic 

 substances but otherwise unexplained as yet. Symptom: 

 shortness of breath, skin irritations, and sometimes death. 



Antibodies Substances developed in the blood serum 

 which neutralize the toxins of bacteria, but this word is 

 usually used with reference to intracellular toxins. 



Antitoxins Antibodies developed in the blood serum 

 which neutralize extracellular toxins of bacteria. 



Asexual Applied to forms that can multiply without 

 being divided into two separate and recognizable sexual 

 elements. 



Attenuate To reduce in virulence. 



