Table 2. 



- Action of B. salmonicida on gelatin with respect to growth, 

 liquefaction, gas and pigment production 



Authority- 



Growth 



Liquefaction & 

 gas production 



Pigment production 



Emmerich and 

 Weibel (1894) 

 after Ark- 

 TO-ight 1912). 

 Marsh (1902). 



Plehn (1909) 

 (after Arkwright 

 1912). 



Plehn (1911) 

 (after Arkwright 

 1912). 



Arkwright (1912). 



Mettam (191-4). 



Williamson 

 (1928). 



Stevens and 

 Keil (1931). 



Duff and Stewart 

 (1933). 



Slow^ very small 

 colonies appeared 

 during first 2 or 

 3 days. 

 Abundant grovrth. 



Growth. 



Growth. 



Organism grew 

 well. 



Surface cultures 

 on gelatin slant 

 caused pitting of 

 surface of medium. 



Rapid growth. 



Rapid growthj 

 flocculent in 

 liquefied medium. 



Growth. 



Later 

 liquefaction with 

 gas production. 



Liquefaction 

 abundant J 

 crateriform 

 infundibular form 

 or stratiform. 

 No mention. 



No mention. 



Liquefaction 

 within 24. or 48 

 hour s J infundibu- 

 lar form. Gas in 

 most cases. 



Rapid lique- 

 faction. 



No mention. 



No mention. 



Culture became 

 slightly brown in 

 10 days and coffee 

 brown in 3 weeks. 

 Pigment after 2 

 weeks J most marked 

 near surface of 

 culture. 



Pigment not usually 

 formed. 



No pigment. 



Liquefaction in 

 24 hours from 

 below upwards. 

 After 48 hours 

 upper part of 

 medium was lique^ 

 fied. Complete 

 liquefaction. 

 Liquefaction in 

 3 to 8 days^ 

 saculate or in- 

 fundibular form. 

 In some cases 

 liquefaction began 

 at bottom of stab, 

 but this was not a 

 constant feature. 



Later, upper part 

 of medium became 

 brown. 



Pigment near surface 

 of liquefied medium 

 after third day. 



A brown ring of 

 pigment was 

 formed at top in 

 20 days. 



15 



