THE BIOLOGICAL CHARACTERS, ETC. 35 



country, owing to the teaching of Murchison, is still fre- 

 quently entertained. A transformation of bacterium coli 

 commune into a typical bacillus typhosus is, according to 

 Blachstein, impossible. These allied micro-organisms, which 

 are probably specifically distinct, though the determination 

 of this can only be decided by methods other than morpho- 

 logical, are likely to arouse even greater interest in the 

 future, since it has been shown by Chantemesse and Widal 

 that Escherich's bacterium, though not directly pathogenic 

 for man as it is for some animals, aids greatly in the growth 

 and generalisation of bacillus typhosus in an infected body. 



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