Summary
The A. outlines the general biological interest of utilizing the induction of mutations — with ionizing radiations and with chemical substances — in order to perform experimental analysis of physiological and biochemical components of symbiotic, more or less harmonic, relationships; and to attempt to figure the process of genetic coaptation that is the result of long evolution.
The A. points out the advantages of applying the induction of mutation to the stady of symbiosis between algae and marine animals and between bacteria or yeasts and insects. He is suggesting, moreover, an extension of the method to Cecidology.