GLOSSARY. 



THE meaning of many words occurring several times in 

 the text is given here that the reader may the more intelli- 

 gently 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 pro- 

 nounced 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 idiosyncrasy 

 to or previous injection with certain organic substances but other- 

 wise unexplained as yet. Symptoms: shortness of breath, skin irri- 

 tations, 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. 



Bacillus (pi., Bacilli) The genus of motile rods in the vegetable 

 kingdom. 



Bacteriacese The family of rod-shaped bacteria. 

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