572 



DESCRIPTION OF SPECIES. 



growtt resembles Streptococcus 

 pyogenes.' 



On potato they form a slimy 

 layer. 



Milk is rapidly coagulated. 



They are pyogenic in dogs and 

 rabbits. Injected into the veins 

 they produce inflammation of the 

 kidneys. 



They were isolated from the 

 urine in a case of Bright's disease. 



Streptococcus perniciosus 



psittacorum {Parrot disease). — 

 Cocci, singly, in chains, and in 

 zoogloea, have been described in 

 connection with a disease of the 

 grey parrot (Psittacus erithacus). 

 This disease is fatal to about 80 per 

 cent, of these parrots imported to 

 Europe. They suffer from diarrhoea 

 and general weakness ; their feathers 

 are ruffled ; their wings hang 

 loosely, and their eyelids close ; 

 convulsions set in, and death fol- 

 lows. At the autopsy greyish 

 nodules are found in the lungs, liver, 

 spleen and kidney. In and around 

 the capillaries of these nodules, and 

 in the blood of the heart, the cocci 

 are found in great numbers in 

 zooglcea, and more rarely in chains. 

 Inflammatory change in the sur- 

 rouiiding tissue is absent. 



Streptococcus pyogenes (p. 178). 



Streptococcus radiatus 

 (Pliigge). — Cocci less than 1 /i in 

 diam., singly, in small masses, and 

 sometimes in short chains. 



Colonies appear in twenty-four 

 hours. They are white, with a 

 yellowish-green sheen ; later they 

 liquefy the gelatine and develop a 

 circlet of rays. 



Inoculated in gelatine, isolated 

 centres form along the track of the 

 needle which throw out horizontal 

 rays. At the same time a funnel- 

 shaped area of liquefaction forms 

 very slowly in the upper part. 



On potato the growth is yel- 

 lowish-brown. 



They occur in air and in water. 



Streptococcus septicus (Fltigge). 

 — Cocci in chains, indistinguishable 

 microscopically from' Streptococcus 

 pyogenes. 



Colonies on gelatine grow more 



slowly than those of most strepto- 

 cocci. 



They are pathogenic. Mice die 

 in forty-eight to seventy-two hours 

 after subcutaneous inoculation of 

 a minute quantity of a cultivation. 

 During the last twenty-four hours 

 there is a distinct motor and sensory 

 paralysis of the hind legs. In 

 rabbits inoculation of the ear pro- 

 duces local redness, then a general 

 disease, and death in two or three 

 days. 



They were found by Nicolaier, and 

 independently by Guarneri, in earth. 



Streptococcus septicus liq^ue- 

 faciens (Babfes).— Cocci -3 to -4 n, 

 in pairs, in short chains. 



Inoculated in the depth of gela- 

 tine a granular filament forms in 

 twenty-four hours along the track 

 of the needle, followed by hque- 

 faction of the gelatine forming a 

 funnel in which the gelatine is 

 clouded ; flat, whitish deposits 

 form on the side of the funnel. 



On the surface of agar minute 

 shining, transparent colonies are 

 formed. 



On blood-serum the growth is 

 almost invisible. 



They are pathogenic. Subcu- 

 taneous injection in mice and 

 rabbits produces local inflammation 

 and oedema, followed by death in 

 about a week. 



They were found in the blood 

 and organs of a child which had 

 died of septicaemia complicating 

 scarlet fever. 



Streptococcus vermiformis 

 (Tils). — Cocci forming motile 

 chains. 



Colonies are yellowish-white, the 

 central portion finely granular, 

 the periphery radiated. 



Inoculated in the depth of gela- 

 tine there is rapid liquefaction, 

 and a yellowish deposit at the 

 bottom of the liquid. 



On potato the culture forms a 

 dirty-yellow layer. 



They were found in water. 



Streptothrix actinomycotica 

 (p. 431). 



Streptothrix al^ba (Gasparini). 

 — A variety of Actinomyces bovis. 



