DESCRIPTION OF SPECIES. 



501 



•& H in width, singly, in pairs, and 

 in short chains, and filaments. 



Colonies throw out delicate 

 branches with a highly characteristic 

 appearance ; the gelatine slowly 

 liquefies, the nucleus of the colony 

 becomes yellow, and the periphery 

 iridescent. 



Inoculated in the depth of gela- 

 tine the bacilli form a cloudiness in 

 the track of the needle, and an 

 iridescent layer on the surface with 

 central depression of the gelatine 

 and commencing liquefaction. 

 Later the liquefaction produces 

 a funnel, and there is a yellow 

 deposit. ' 



On the surface of agar the layer 

 is a dirty orange colour. 



On potato the growth is orange 

 red with irregular protuberances, 

 and limited in growth. 



They occur in water. 



Bacillus argenteo-phosphores- 

 cens (Katz), No. I.— Rods slightly 

 curved with pointed ends, 2-5 fi in 

 length, width one-third of their 

 length ; singly, in pairs, and long 

 wavy filaments. 



Colonies circular ; at first trans- 

 parent droplets, later yellowish in 

 colour. 



On the surface of gelatine they 

 form a greenish-yellow film. 



In broth they produce turbidity, 

 and later a skin on the surface, and 

 on sterilised fish a pale-yellow sticky 

 growth. 



Cultures are photogenic. 



They were isolated from the sea 

 at Sydney. 



No. II. — Rods with rounded ends 

 "27 /i in length, -67 /i in width, and 

 filaments. 



Colonies on gelatine are circular 

 with sharp contours and greyish- 

 yellow in colour ; later they ai-e 

 irregular and granular. 



Inoculated in gelatine the bacilli 

 form a greyish-white filament in 

 the track of the needle, and a shining 

 patch on the surface. 



On the surface of obliquely solidi- 

 fied gelatine they form a bluish- 

 grey film. 



In broth they produce only 

 turbidity. 



Cultures are photogenic. 



They were isolated from phospho- 

 rescent fish. 



No. III. — Rods not so thick as 

 those of No. II., singly, in pairs, and 

 filaments. They are motile. 



Colonies are white, scaly, and 

 wrinkled. 



On the surface of gelatine the 

 growth spreads over the medium. 



On agar the growth is scanty. 



In broth they produce turbidity 

 and a skin floating, on the surface. 



Cultures are photogenic after a, 

 few days' growth. 



They were isolated from a piece 

 of cuttle-fish. 



Bacillus argenteo-phospliores- 

 cens liquefaciens. — Rods straight 

 or slightly bent, 2 /x in length, and 

 in width one-third of then- length ; 

 filaments. 



Colonies circular, pale brown or 

 pale yellow and, after liquefabtion, 

 with radiating processes extending' 

 into the surrounding gelatine. 



Inoculated in the depth of gela- 

 tine there is a growth in the track 

 of the needle, and near the surface 

 a cup-shaped area of liquefaction. 



In broth they produce turbidity,, 

 and form a skin on the surface. 



On sterilised fish they form a 

 yellow layer. 



They are photogenic but not 

 markedly so. 



Bacillus aurantiacus (Frank- 

 land). — Rods short and thick, singly, 

 in pairs, and in filaments. 



Colonies are prominent and pale- 

 orange in colour. 



Inoculated in the depth of gela- 

 tine there is a slight growth in the 

 track of the needle and an orange 

 patch on the free surface. 



On agar and potato the growth 

 is also orange. 



The3' occur in water. 



Bacillus aureus (Adametz).— 

 Slender rods straight or slightly 

 bent, 1'5 to 4 ^ in length, and '6 ft 

 in width ; in pairs, filaments, and 

 masses. They are motile. 



Colonies circular or oval and 

 yellow in colour. 



Inoculated in the depth of gela- 

 tine the growth is very limited in 



