CLASSIFICATION QF BACTERIA 285. 



IV. PATHOGENICITY. 



1. Pathogenic to Animals. — Insects, crustaceans, fishes, reptiles, birds, mice, 



rats, guinea pigs, rabbits, dogs, cats, sheep, goats, cattle, horses, monkeys, 

 man. 



2. Pathogenic to Plants. 



3. Toxins, soluble, endotoxins. 



4. Non-toxin forming. 



5- Immunity bactericidal. 



6. Immunity non-bactericidal. 



7. Loss of virulence on culture media: prompt, gradual, not observed- 



in months. 



GLOSSARY OF BACTERIOLOGICAL TERMS USED IN DESCRIBING AND 

 IDENTIFYING SPECIES OF BACTERIA. 



(Committee on Identification of Species : Soc. Am. Bact.) 



AGAR HANGING BLOCK, a small block of nutrient agar cut from a poured'. 



plate, and placed on a cover-glass, the surface next the glass having been . 



first touched with a loop from a young fluid culture or with a dilution from. 



the same. It is examined upside down, the same as a hanging drop. 

 AMEBOID, assuming various shapes like an ameba. 

 AMORPHOUS, without visible differentiation in structure. 

 ARBORESCENT, a branched, tree-like growth. 

 BEADED, in stab or stroke, disjointed or semi-confluent colonies along the line 



of inoculation. 

 BRIEF, a few days, a week. 



BRITTLE, growth dry, friable under the platinum needle. 

 BULLATE, growth rising in convex prominences, like a blistered surface. 

 BUTYROUS, growth of a butter-like consistency. 

 CHAINS,— Short chains, composed of 2 to 8 elements. Long chains, composed. 



of more than 8 elements. 

 CILIATE, having fine, hair-like extensions, like cilia. 

 CLAVATE, club-shaped. 



CLOUDY, said of fluid cultures which do not contain pseudozoogloeae. 

 COAGULATION, the separation of casein from whey in milk. This may take 



place quickly or slowly, and as_ the result either of the formation of an acid. 



or of a lab ferment. 

 CONTOURED, an irregular, smoothly undulating surface, like that of a relief 



map. 

 CONVEX, surface the segment of a circle, but flattened. 

 COPROPHYL, dung bacteria. 



CORIACEOUS, growth tough, leathery, not yielding to the platinum needle. 

 CRATERIFORM, round, depressed, due to the liquefaction of the medium. 

 CRETACEOUS, growth opaque and white, chalky. 

 CUNEATE, wedge-shaped. 

 CURLED, composed of parallel chains in wavy strands, as in anthrax colonies... 



