ISABEL MULFORD. B37 
whose laboratory it occurred spontaneously. My efforts 
at culture, were, however, unsuccessful. 
The cells are very small, slender rods, measuring .3— 
Au by .6-1.6h. 
Bacterium incarnatum, Trelease. This isa rather com- 
mon species. While maintaining the same microscopic 
characters, it shows considerable variation in color, It 
may be seen in all shades froma pale and dull flesh 
color to a deep, reddish brown, the cultures assuming a 
darker color as they grow old. The texture is smooth 
and waxy like that of B. aurantiacum. The cells are 
about .44in diameter, and from 1-2y in length. 
Bacterium chlorinum, Trelease ; Micrococcus chlori- 
nus, Cohn. It was with some difficulty that I obtained a 
pure culture of B. chlorinwm. Though it has a good 
deal of vitality, it readily yields its place to other forms, 
even after it has made considerable growth in a clear 
field. 
It is of a greenish-yellow or sometimes of a deep yel- 
lowish-green color, and when well established will cover 
the potato with a smooth growth of waxy consistence. 
The cells are rather short and measure .5/ by .8-1.6y. 
At one time a slice cut from the middle part of a 
potato was inoculated with this form. For a week or 
two I thought the culture decidedly pure, but it was 
afterwards overspread with a growth of I. prodigiosus, 
so that scarcely a trace of chlorinum was seen above or 
below. A month later, green zooglwez# appeared in a 
few little round dots. The color was much brighter 
and more intense than the original chlorinum. The 
- zoogloeee contained multitudes of spherical cells mingled 
with a few rods. I felt inclined to think that this was 
B. chlorinum in a new stage of development; either a 
spore-bearing state, or one in which the cells became 
short and spherical from lack of sufficient nourishment. 
Prof. Trelease, however, whom I consulted, thought I 
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