44 ADAPTATION AND DISEASE 



myalgia this rose to 93 per cent. Cultures of cocci are rarely 

 gained from the spinal cord of the inoculated animals (4 per 

 cent) ; thirty-six animals inoculated with cultures from a case 

 of sporadic anterior poliomyelitis yielded 78 per cent of positive 

 results, i.e. of growths of streptococci obtainable from the spinal 

 cord. 



With these examples before us is it possible for medical men 

 not to believe in " direct adaptation " ? According to the 

 environment so do bacteria assume special properties. 



