JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE VII, 



Illustrating Mr. G. F. Dowdeswell's Paper on " The Micro- 

 organisms which occur in Septicaemia/^ 



Fig. 1 represents a section of the lungs of a septicsemic mouse, deeply 

 stained with methyl aniline violet, and treated with a solution of sodic 

 carbonate. 



A shows a large vein in longitudinal section, in which amongst the 

 red blood-corpuscles numerous deeply stained white corpuscles are 

 seen ; these are full of the minute Bacilli described in the text, which 

 are also found free on the inner surface of the walls of the vessel. 

 b b are capillary blood-vessels, seen in transverse section, in which 

 some few of the same bodies occur. The tissues, in making the pre- 

 paration, have separated from the walls of the vessel. The magnifica- 

 tion is about 160 diam. 



Figs. 2 and 3 show the relative size of the organisms described, sketched 

 by the camera lucida and magnified 2800 diam. 



The small rods in Fig. 2 are the Bacilli first described in the text ; 

 their length is about ytooo'''^ ^^- ^^ the lower part of the figure are 

 shown portions of an organism also described as identical with the 

 B. anthracis or hay Bacillus. In the centre are given three red 

 blood-corpuscles of the mouse ; their size is somewhat less than those 

 of man, viz about -joVo*^ i'^- 



Fig. 3 shows the most minute form of Bacillus described, the B. sepii- 

 ceBDiia of Koch ; both the rods free as they appear on the walls of the 

 vessels, and agglomerated in masses within the white blood-corpuscles. 



