GLOSSARY. 141 
Fermentation. The decomposition of complex substances into 
simpler forms by the action of a ferment. 
Flagellum (pi. flagella). A whip-like process extending from 
the body of a bacterium which propels the organism 
about. 
Filtration. The passage of fluid through a filter to remove 
the solid particles. 
Hemoglobin. The coloring matter contained in the red blood- 
corpuscles which gives the blood its red color. 
Hemolysis. The solution of red blood cells. 
Immunity. The resistance of the body to disease. 
Incubation. The period between the entrance of disease-pro¬ 
ducing bacteria into the body and the signs and symptoms 
of disease. 
Infection. The entrance into the body of bacteria resulting 
in injury or disease. 
Inhibition. The arrest or restraint of bacterial growth. 
Inoculate. To put infectious material into the body to pro¬ 
duce disease or into culture media to produce bacterial 
growth. 
Larva (pi. larvae). The stage of insect development after it 
leaves the egg in which it resembles a worm. 
Lesion. An abnormal condition of any tissue or organ due 
to injury or disease. 
Leucocyte. The white blood-corpuscle of the blood. 
Luetin reaction. A skin test for the detection of syphilis. 
Lumbar puncture. The introduction of a needle into the 
space around the spinal cord for the removal of the cere¬ 
brospinal fluid. 
Medium (pi. media). The material used for the cultivation 
of bacteria. 
Meningitis. An inflammation of the membranes covering the 
brain and spinal cord. 
Morphology. The study of the form and structure of bacteria. 
Mycelium. The thread-like processes of fungi. 
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