552 



DESCRIPTION OF SPECIES. 



needle, and a prominent hemi- 

 spherical yellow growth on the free 

 surface. 



On agar the growth is orange- 

 yellow, and on potato yellow and 

 slimy. 



They occur in water. 



Micrococcus botryogenus 

 (Johne, Rabe). Cocci 1 to 1'5 p, in 

 diam., in wavy chains. 



Colonies circular, sharply defined. 

 At first silver-grey, later yellowish- 

 grey with metallic lustre, they 

 produce an odour like that of 

 strawberries. 



Inoculated in the depth of gela- 

 tine a greyish- white filament de- 

 velops, with slight liquefaction of 

 the gelatine ; later, it becomes 

 milk-white, and at its upper part a 

 characteristic bubble appears. 



They make hardly any growth 

 on agar. 



On potato they grow very abun- 

 .dantly, forming a yellowish layer 

 with the same odour as the colonies 

 on plate cultivations. 



Inoculated guinea-pigs die of 

 septicaemia ; in sheep and goats 

 severe inflammation spreads from 

 the point of inoculation. Mice are 

 immune. In horses an inflamma- 

 tory oedema is at first set up, 

 followed in four to six weeks by 

 the formation of new growths, 

 which sometimes suppurate and 

 contain large numbers of micro- 

 cocci. 



They were found in tumours of 

 the spermatic cord and of the 

 connective tissue in other parts in 

 horses. 



Micrococcus candicans 

 (Fliigge). Cocci which collect in 

 masses. 



In plate-cultivations they form 

 in two or three days milk-white 

 colonies ; while those below the 

 surface of the gelatine are yellow- 

 ish. Under a low power the deep 

 colonies are quite circular, with 

 smooth margins, of a blackish-brown 

 colour, and very slightly granular ; 

 the superficial colonies are quite 

 irregular in outline, and are finely 

 granular. 



Cultivated in test-tubes they form 



a white nail-shaped cultivation. 

 They were isolated from contami- 

 nated plate-cultivations. 



They occur in the air. 



Micrococcus candidus(Cohn). 

 Cocci forming snow-white points 

 and spots upon slices of cooked 

 potato. 



Micrococcus carneus (Zimmer- 

 mann). Cocci *8 /z in diam., occur- 

 ring in masses. 



Colonies circular, greyish-white, 

 with the centre tinged with red. 



Inoculated in the depth of gela- 

 tine they form a white, granular 

 filament in the track of the needle, 

 and a pale pink layer on the free 

 surface. 



On the surface of oblique gela- 

 tine a flesh-coloured layer develops, 

 which later assumes a violet colour. 



On agar the growth is similar. 



On potato the growth is abundant 

 and red in colour. 



They were isolated from water. 



Micrococcus cerasinus siccus 

 (List). Cocci *25 to '12 p in diam., 

 singly and in pairs. They can best 

 be cultivated at 37 C. 



On agar they form a cherry-red 

 layer, and a similar growth on 

 potato. 



The pigment is insoluble in alco- 

 hol, ether, and water, and is not 

 destroyed by acids or alkalies. 



They occur in water. 



Micrococcus cereus albus 

 (p. 178). 



Micrococcus cereus flavus 

 (p. 178). 



Micrococcus cinnabareus 

 (Fliigge). Large cocci occurring in 

 twos, threes, and fours. 



Colonies develop very slowly, and 

 are punctiform, and bright red at 

 first, and afterwards reddish-brown. 



The cocci inoculated on the sur- 

 face of gelatine form a heaped-up, 

 red-coloured growth. 



They were found contaminating 

 old cultivations. 



Micrococcus citreus (List). 

 Cocci 1'5 to 2-2 /j. in diam., singly, 

 in pairs and chains. 



Colonies are irregular in form, 

 moist and shining, and yellowish in 

 colour. 



