132 



K. V. KossiKOv 



If we accept that the cell structure is the manifestation of 

 the specificity of metabolic processes occurring in this cell, and 

 that alterations in metabolism are the principal or really the 

 sole cause of the development of new forms, we can then 

 clearly understand the (usually negative) action of irradiation, 



^^a 



Fig. 5. Scheme of inheritance, by S. glohosus cells, of newly- 

 acquired ability to ferment sucrose during sexual repro- 

 duction (spore formation). 



a: non-fermenting sucrose, invertase activity = 0; 



6: fermenting sucrose, invertase activity = + ; 



c: fermenting sucrose, invertase activity = -|--j-. 



leading to disturbances in structure and function, and the 

 creative role of induced change in metabolism in the process of 

 adaptation to the changed modus vivendi. 



Certainly, the substrate cannot cause changes, in all cases 

 and under all conditions, which will remain stable in the 

 progeny. We believe that, as a rule, it is those changes con- 

 nected with the necessity of adaptation to new sources of 



