RECOMBINATION IN VIRUSES AND BACTERIA 149 



basis of an intracellular transformation, or an irregular pairing of genetic 

 material, or in some other terms, is yet to be seen. 



These mechanisms of genetic exchange have become established during 

 the period since 1940. The whole concept of infectious heredity is still 

 novel, and new information is being obtained at a rapid rate. Certainly, 

 basic discoveries about recombination are yet to come. The question 

 of how similar will be the findings in the somatic cells of higher organ- 

 isms is fraught with interest for such subjects as embryology, cancer, and 

 senescence. 



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