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The glanders bacillus is somewhat shorter and dis-
tinctly thicker than the tubercle bacillus. It has rounded
•ends, and it generally occurs singly, though upon blood-

•'VVr'l5{ '>

FlG. 66.—Bacillus mallei,  from  a culture upon glycerin agar-agar;   x   looo
(Frankel and Pfeiffer).

serum, and especially upon potato, several joined indi-
viduals may be found. Long threads are never formed.

The bacillus is non-motile. Various observers have
•claimed the discovery of spores, but although in the
interior of the bacilli there have been observed irregular
spaces like the similar spaces in the continuity of the
tubercle bacillus not colored by the stains, they have
not yet been definitely proven to be spores. The ob-
servation of Loffler that the bacilli can be cultivated
after being kept in a dry state for three months makes it
appear as if some permanent form (spore) occurs. No
flagella have been demonstrated upon the bacillus.

Like the tubercle bacillus, the glanders bacillus does
not seem to find conditions outside the animal body suit-
able for its existence, and probably does not occur except
as a parasite.

The organism only grows between 25° and 42° C., and
generally grows very slowly, so that attempts at its isola-