14. 



Th 3 similarity in forTj and app 3aranc : of a 

 polypeptide spiral to a "bacillus or a spirillum 

 will be apparent. It should be capable of graving 

 -endwise by condensation with additional amino acid 

 radicals, and as long as tho spiral form is main- 

 tained the structure will possess definite mor- 

 phology. It must remain permanently right-handed 

 or left-handed which appears to account for the 

 optical activity always s^±Libited by substances 

 obtained from living organisms. It should be 

 capable, during growth, of acquiring different 

 arrays of side chains upon being nourished with 

 different kinds of amino acids, and thus exhibit 

 the characteristic of variability. It would not, 

 however, upon division, be capable of transmitting 

 to its progeny any permanently inheritable ch ' rac 

 teristics, and can therefore not be regarded as a 

 complete living organism. 



