548 



DESCRIPTION OF SPECIES. 



brownish deposit surrounded by 

 liquefied gelatine which has a violet 

 or greenish tinge. 



Cioculated in the depth of gela- 

 tine they produce liquefaction along 

 the track of the needle, with a 

 hemispherical excavation of the 

 gelatine at the upper part. An 

 iridescent film floats on the surface 

 and a greenish sediment forms at 

 the bottom of the liquefied area. 



On agar the layer is brownish. 



On potato the growth is granular, 

 and the potato in the vicinity has 

 a bluish colour. 



They were cultivated from the 

 na«al mucus. 



Diplococcus inter cellularis 

 meningitidis (Weichselbaum). — 

 Cocci singly, in pairs, tetrads and 

 masses. They grow at 37°C. 



Colonies on agar are granular and 

 yellowish-brown. 



On the surface of agar they form 

 a greyish-white viscid growth. In 

 the depth of agar the growth only 

 occurs in the upper part of the 

 needle track. 



On blood serum and broth there 

 is very little growth, and none on 

 potato. 



Cultures quickly lose their 

 vitality. 



They . are pathogenic in mice, 

 guinea-pigs, rabbits, and dogs. 



They were isolated from the exu- 

 dation in cases of cerebro-spinal 

 meningitis, and were observed in 

 the interior of pus cells. 



Diplococcus luteus (Adametz). 

 — Cocci 1'2 to 1".3 fj. in diam., singly 

 and in chains. Motile. 



Colonies are circular and slightly 

 yellow, and granular. Old colonies 

 are bright yellow. 



On the surface of gelatine a 

 growth occurs in concentric circles 

 of a lemon-yellow colour, and the 

 gelatine is coloui'ed reddish-brown. 

 After several weeks liquefaction 

 sets in. 



On agar a yellow layer forms, and 

 the jelly is coloured reddish-brown. 



On potato the growth changes 

 from yellow to brown. Milk is 

 coagulated. 



They were obtained from water. 



Diplococcus of pneumonia in 

 horses (Schutz). — Oval cocci, singly 

 or in pairs, capsulated. 



Colonies small and white. 



In the depth of gelatine a row of 

 colonies develops in the track of the 

 needle. 



On agar the growth is composed 

 of transparent droplets. 



Injection into the lung is said to 

 produce pneumonia, ending fatally 

 in eight or nine days. 



They are pathogenic in rabbits, 

 guinea-pigs, and mice. 



They were isolated from the 

 lungs of a horse suffering from 

 pneumonia. 



Diplococcus roseus (Bumm). — 

 Cocci identical in description with 

 gonocQcci. 



Colonies are pink, granular, and 

 irregular in form. 



Inoculated in the depth of gela- 

 tine the cocci grow freely in the 

 track of the needle and on the 

 surface, developing a pink colour 

 and slowly producing liquefaction. 



They are present in the air. 



Diplococcus subflavus (Bumm). 

 — Diplococci similar to gonooocci. 



Colonies greyish-white, later 

 yellow. 



They grow in gelatine and on 

 blood serum, and liquefy broth. 



They produce suppuration when 

 injected subcutaneously in man. 



They were isolated from lochial 

 discharges, the vesicles of pem- 

 phigus, and from the secretion in 

 colpitis in children. 



They stain by Gram's method. 



Hsematococcus bovis (Babes). — 

 Cocci oval, singly, in pairs, and in 

 masses. 



Inoculated in the depth of gela- 

 tine minute colonies develop in the 

 track of the needle. 



On agar the growth is composed 

 of transparent droplets. 



On potato a yellowish shining 

 film is formed. 



On blood serum the growth is 

 similar to that on agar. 



They produce a fatal result in 

 rabbits and guinea-pigs in a week 

 or ten days. 



They were isolated from the 



