C30 FURTHER REMARKS ON PHOSPHORESCENT BACTERIA. 



III. (VI). 



The third (or sixth) kind was derived from a luminous fragment 

 of squid, as already noticed above. As name for it I propose i>«- 

 cillus a7'genteo-2?hosphorescens III. Under high powers it exhibits 

 pretty much the same proportions of length and width as that of 

 the former kind. In cultures in nutrient meat-broth the rods are 

 seen to be motile ; they form, here and there, short threads. 



Alkaline methylene-blue is readily and uniformly taken up by 

 them. 



By growing them on or in gelatine, the latter does not become 

 liquefied. 



With regard to the light which their cultures emit in the dark, 

 it may be said that it resembles, on the whole, that of the two kinds, 

 named £. argenteo-jyhosphorescens I. and II., more especially the 

 latter. But, in other respects, there are considerable differences 

 between these two and the one in question. Here I need only 

 state that the duration of the phosphorescence of the latter is 

 shorter than that in the case of B. arg.-ph. II., and still shorter 

 than that of B. arg.-ph. I. Streak-cultures on gelatine (6 p.c, 

 alkaline) also afford a convenient means of distinction between 

 No. Ill, and the two others. No. III. grows in the streak far 

 more luxuriantly than do Nos. I. and II. By comparing equally 

 aged but young cultures, say of the second day, with one another, 

 one notices at once, that III. presents a ribbon-like superficial 

 layer, fully double as broad as that of II., and somewhat less than 

 double the width of that of I. The colour and general appear- 

 ance of the streak-culture of III. is, save insignificant deviations, 

 about the same as that of II. 



