New YorK AGRICULTURAL EXPERIMENT STATION. 101 
translated later into German. Judging from correspondence 
with Prof. Potter, the casual organism had been lost before 
the autumn of 1902. In February, 1903, he kindly furnished 
us, for use in this comparative study, a culture which he had 
freshly isolated and believed to be Pseudomonas destructans. 
However, a flagella stain showed that this was a peritrichic 
organism and therefore would be classed, according to Migula, 
as a bacillus. 
The organism which we received can hardly be looked upon 
as an accidental contamination since it is a typical member 
of the group producing soft rot in plants and is undoubtedly 
a true English representative of this widespread group. The 
failure of Prof. Potter to reisolate a Pseudomonas from de- 
caying vegetables is not surprising in view of the fact that 
during the years in which we have been frequently making 
such isolations we have never isolated a white liquefying 
Pseudomonas producing this decay. 
Later we obtained a culture labeled Pseudomonas destruc- 
tans from Kral, but this was possibly derived from the same 
culture sent us under that name by Prof. Potter as it was 
likewise a bacillus. 
In January, 1909, Professor Potter kindly furnished a 
third freshly isolated culture of Psewdomonas destructans. 
The arrangement of the flagella on this was also peritrichiate 
and consequently it should be classed as a bacillus. In this 
paper the culture furnished us by Prof. Potter in 1903 will be 
designated as Potter’s Bacillus. 
Reference has already been made to the publications by 
Professor Jones on the soft rots of carrot and other vege- 
tables. These publications not only included an extended 
description of Bacillus carotovorus, but also gave the results 
of extensive tests of its pathogenicity when inoculated into 
a large number of common vegetables. These results showed 
that, under proper conditions, soft rots of a long list of com- 
mon vegetables could be produced by inoculations from a pure 
culture of this germ. Fortunately the original type culture 
®Potter, M. C. Ueber eine Bakterienkrankheit der Riiben (Brassica 
Napus). Centbl. Bakt. u. Par., HL, 7: 282-288; 353-362. 1901. 
