338 PATHOGENIC MICROCOCCI NOT HERETOFORE DESCRIBED. 



43. STREPTOCOCCUS PERNICIOSUS PSITTACORUM. 



Micrococcus of gray parrot disease. Eberth and Wolff have described 

 an infectious disease of gray parrots, which is said to be extremely fatal 

 among the imported birds. The disease is characterized by the formation of 

 nodules upon the surface and in the interior of various organs, and especially 

 in the liver. Micrococci of medium size are found in these nodules and in 

 blood from the heart; these are sometimes in chains. Microscopic examina- 

 tion of stained sections shows that these cocci are directly related to the tis- 

 sue necrosis which characterizes the disease. But the micrococcus has not 

 been cultivated and its biological characters are undetermined. 



44. MICROCOCCUS OF FORBES. 



Forbes (1886) has studied an infectious disease of cabbage caterpillars 

 (Pieris rapse), which appears to be due to a micrococcus found by him in 

 large numbers in the bodies of the infected larvae. This micrococcus, which 

 resembles the common staphylococci in form, was cultivated in liquid media 

 and successful inoculation experiments were made. 



44A. STREPTOCOCCUS AGALACTI^E CONTAGIOS^. 



Obtained by Adametz (1894) from the milk of cows suffering from mas- 

 titis (Gelben Gait). According to Adametz all of the streptococci which 

 have been described by different investigators (Kitt, Nocard and Mollereau, 

 Guillebeau, and others) are probably varieties of a single species. 



Morphology. Spherical cocci in short chains 1 p in diameter. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 efying streptococcus. 



Jpon gelatin plates forms flat, transparent, white or bluish-white, 

 slimy colonies, having a slight pearly lustre and an irregular outline. In 

 nutrient gelatin containing five per cent of milk sugar the colonies, at the 

 end of eight days, have a diameter of 0.85 to 1 millimetre; they are milk- 

 white and of a semi-fluid, slimy consistence. 



Upon agar plates the deep colonies are jmnctiform and white in color- 

 under a low power they are seen to have an irregular dentate contour and a 

 brownish color; the superficial colonies gradually assume the appearance 

 of transparent, flat drops having a diameter of 0.5 to 0.7 millimetre. In 

 sterilized milk fermentation occurs, at 37 C., in from twenty to twenty-four 

 hours; some hours later the casein is precipitated, fine gas bubbles are seen 

 in the lower part of the fluid and a foam upon the surface; the reaction is 

 acid and the casein is not peptonized. The power of producing acid and gas 

 is diminished or lost after a few successive cultures have been made. 



Streptococcus mastitis sporadice (Guillebeau) is said by Adametz to be 

 distinguished from the streptococcus above described (No. 44A) by being 

 smaller 0.5 p. in diameter and by the fact that the cultures do not lose the 

 power of producing fermentation in milk. 



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