769 
were they in any way suggested clinically. Pirquet was negative. 
Description of the Micro-organism. 
Morphology. 
We observed the following forms varying according to the media 
and the age of the cultures: 
Plump short rods: length 1 w, breadth */, u. The short- 
ness of some reminds us of coccobacilli of less than 1 u dia- 
meter ‘a minority on LOEFFLER’s serum; in eight-week-old 
cultures on Bordet medium almost exclusively ; a majority 
on agar-plates a few days old). 
Small fine rods: polar staining, length from 1'/,—2 u, 
breadth + */, u (in every medium of any age). 
Rods of from 2—8 u with polar granules, or more granules 
(they are far predominant in the older cultures on LOEFFLER’s 
serum). 
Comma-shaped rods: in many cases to be divided into 
two shorter rods, length + 1°/, u, breadth */, u (on Bordet 
medium, ascites-agar, and Lorrrirr’s serum ; in the first ascites- 
agar-culture longer and finer than in the later). 
Granular rods of different dimensions; length varying 
from 5—7 u, breadth from */,—1*/, u. This considerable breadth 
concurs with a prickly shape found on the Bordet-medium, 
the rods being broader in the middle and becoming more 
pointed towards the extremities. The greater breadth is in 
many bacilli due to the irregular arrangement of the protuberant 
granules. 
In older cultures some giant forms, which however have 
not at all lost their original structure, i.e. a distinct body, in 
which the granules are seen. 
Occasionally branching forms were observed in various 
media (Bordet-medium, fluid and solid, LorrFrrLer’s serum, and 
canesugar-nutrose). 
Rows of granules: only granules arranged as in the 
granular rods but without a visible cell-body. The arrange- 
ment is not regular, the granules being placed longitudinally 
in different directions relative to the long axis of the granular 
rod or row. 
Involution-forms: clubbed or swollen ends (in old enl- 
tures) and spheric forms to 2 u. 
Motility is lacking 
