V.] VARIOUS SPECIES OF COMMA-BACILLI. 93 



II. The late Dr. T. R. Lewis was the first to point out 1 

 the occurrence, in the fluid of the mouth, of comma-bacilli 

 morphologically identical with those of Asiatic cholera. They 

 are of the same size, of the same kind of curvature, single 

 or S- sna ped, and they move like the choleraic comma- 

 bacilli. This simple fact, which is easily verified, had 



@ f CS 



v* ' * 



FIG. 31. COVER-GLASS SPECIMEN OF CONTENTS OF C^CUM FROM A NORMAL 

 GUINEA-PIG. 



1. Small comma-bacilli. 



2. Spirilla of same. 



3. Larger comma-bacilli. 



4. Large coiled organisms. 

 Magnifying power about 700. 



entirely escaped Koch. He said 2 that he had examined 

 the saliva of the mouth and had not seen anything like 

 comma-bacilli. It seems, therefore, to say the least, very 

 remarkable that some of Koch's adherents should have 

 made so light of Lewis's discovery ; they appeared to take 

 1 Lancet, September 20, 1884. 2 Loc. cit. p. 25. 



