368 



TIMOTBY RICHARDS LEWIS. 



became elongated to from twice to eight times their original 

 length, and gradually still further increased, till more than a 

 hundred times this length (fig. 4). Some of the filaments now 

 were finely granular, and, here and there, dotted with strongly 



i'lG. '6. 



EiG. 4. 



Tig. 3. — Bacillus anthracis from the blood of a guinea-pig. Translucent 

 bacillus-rods, undergoing segmentation. Blood-corpuscles are scat- 

 tered throughout the field. (After Koch.) x 650 diam. 



Pig. 4. — Bacillus anthracis from the spleen of a mouse after a three-hour 

 "cultivation" iu a drop of aqueous humour. (After Koch.) x 650 

 diam. 



refractive molecules, which are believed to be the desired '^ rest- 

 ing-spores/' Very soon nothing remained visible but these 

 ' spores,' as the filament appeared to undergo solution, but the 

 persistence of the arrangement of the former in rows is suffi- 

 ciently marked to identify them. They will remain unaltered in 

 this state for several wrecks. 



It will be remarked that the interpretation placed on the cha- 

 racter of these refringent bodies clashes with what is so strongly 

 maintained by Nageli, who, as mentioned already, declares em- 

 phatically that the group of lower organisms to which these be- 

 long multiply soleli/ by fission. It is, therefore, of greater impor- 

 tance to note precisely what the facts adduced are, to prove that 

 in this special instance germinating spores are produced. 



Dr. Koch states that the fact of his being able to induce 

 splenic fever, together with a plentiful crop of bacilli in the 

 blood, with fluid in which not a trace of bacillus filament is 

 any longer to be found — the minute refractive corpuscles 

 alone remaining, is proof sufficient to show that the latter 

 are in reahty spores, and not products of disintegration 



