BY DR. OSCAR KATZ. 629 



Cant., H. melanocJdr, Cuv, and Val.), purchased at the same time 

 and from the same place. These fragments of squid and gar-fish, 

 after having been moistened with sea- water, and placed in a moist 

 chamber, were found to be phosphorescent all over in the evening 

 of the very day on which they were put aside. Cultures of the 

 luminous mucus at the surface of these objects yielded, among 

 numerous other ones, some colonies of this bacillus ; but in a 

 tube of gelatine mixed with some of a salt-infusion of the material 

 from the squid, there appeared one other colony which consisted 

 of the micro-organism next to be mentioned. 



Bacillus argenteo-phosphorescens II. shows in cover-glass pre- 

 parations from gelatine cultures, short, always straight rods, with 

 their ends rounded ; length up to about •0027 mm., yet most of 

 the rods in the preparations are shorter ; width about "00067 mm. 

 In a drop of nutriant meat-broth they do not exhibit spontaneous 

 movements ; besides individual bacilli and diplo-forms, threads 

 made up of few links, and short filaments in which there is no 

 interruption, occur. 



They stain well and uniformly with alkaline methylene-blue. 



They do not cause liquefaction of the gelatine which serves as 

 nutritive soil to them. 



The light given off from pure cultures of this microbe is of a 

 bright silveiy colour, and is somewhat more intense than that of 

 of Bacillus argenteo-phospliorescens (I.e., p. 333) ; this is espe- 

 cially noticeable in cultures on boiled fish at 21°-24° C, and then 

 also it may be noticed that the colour of the light emitted by the 

 former is greenish-silvery. 



On the ground of morphological and physiological characters 

 the organism under consideration is distinguished from that 

 referred to ; for instance, it is very easy to demonstrate this 

 difference by means of streak-cultures on gelatine, whex'e in the 

 one case {B. arg.-phosph. I.), a flat, waxy yellow ribbon with 

 glassy lustre is produced, whereas in the other {B. arg.-phosph. 

 II.), the ribbon has a whitish colour with less pi'ominent lustre, 

 which is rather of a greasy appearance. 



