DESCRIPTION OF SPECIES. 



547 



which, by vertical fission, break up 

 into globular forms (cocci). These 

 again develop into new threads, 

 either within the sheath, eventually 

 penetrating it, or after they are set 

 free. 



The micro-organism appears in 

 little whitish or brownish tufts in 

 wells and drain-pipes, and it not 

 only renders drinking-water foul, 

 but may stop up the narrower 

 pipes. 



Diplococcus alT}icaiis ampins 

 (Bumm). — Cocci resembling gono- 

 cocci but much larger, singly and 

 in tetrads. 



Colonies are prominent and 

 greyish-white. 



In. the depth of gelatine they 

 produce a greyish-white growth in 

 the track of the needle and on the 

 free surface. They slowly liquefy 

 the gelatine. 



They were obtained from the 

 vaginal mucous membrane. 



Diplococcus albicans tardis- 

 simns (Bumm). — Cocci morpho- 

 logically identical with gonococoi. 

 They grow extraordinarily slowly 

 on gelatine. 



They form very minute colonies, 

 which are opaque and greenish- 

 brown in colour. 



Inoculated in the depth of gela- 

 tine isolated greyish- white colonies 

 develop in the track of the needle, 

 and on the free surface a thin, 

 white, waxy film with dentated 

 edge. 



On agar the growth is very 

 similar. 



They were isolated from the 

 vaginal mucous membrane. 



Diplococcus citrens conglome- 

 ratus (Bumm). — Cocci in pairs 

 resembling gonococci, 1'5 ;x in diam., 

 in tetrads and in masses. 



Colonies lemon-yellow ; irregular 

 in form. 



Inoculated in the depth of gela- 

 tine the cocci develop in the track 

 of the needle, and liquefaction com- 

 mences at its upper part. 



The growth on the free surface 

 is yellow, and floats on the liquefied 

 gelatine or subsides to the bottom 

 of the liquefied area. 



They are present in gonorrhceal 

 pus, in air and in dust. 



Diplococcus citrens liqne- 

 faciens (Unna). — Oval cocci -4 to 

 •1 /u, in diam., in pairs, tetrads, 

 short chains, and masses. 



Colonies appear in the form of 

 circular discs, at first greyish-white, 

 later lemon-yellow. They are finely 

 granular, and have sharply defined 

 contours. 



Inoculated in the depth of gela- 

 tine, at the end of a week the 

 growth is found on the free 

 surface, forming a shining yellow 

 layer ; in two weeks liquefaction 

 commences, and the growth floats 

 on the liquefied gelatine which is 

 also yellowish and turbid. 



On the surface of agar a yellow- 

 ish-brown layer is rapidly formed. 



The appearance is similar on 

 potato. 



They were isolated in cases of 

 eczema seborrhoeicum. 



Diplococcus coryzae (Hajek). — 

 Large diplococci. 



Colonies are white, prominent. 



Inoculated in the depth of gela- 

 tine the growth resembles the 

 pneumococcus. 



On agar a white layer is formed. 



They are probably identical with 

 Priedlander's pneumococci. 



They were isolated from the 

 mucus in acute nasal catarrh. 



Diplococcus flavus liqnefaciens 

 tardus. — Cocci resembling gono- 

 cocci. 



Colonies are circular, shining, 

 and chrome-yellow in colour. 



Inoculated in the depth of gela- 

 tine a yellowish growth occurs 

 along the needle track, and also 

 on the free surface. In a month 

 the surface is depressed, but the 

 gelatine is not liquefied until about 

 two months have elapsed. 



On agar a yellowish-white layer 

 is formed, and on potato the colour 

 is more pronounced. 



They were isolated from the 

 skin in eczema seborrhoeicum. 



Diplococcus fluorescens foeti- 

 dus (Klamann). — Cocci in pairs and 

 chains. 



Colonies circular, forming a 



