INFECTIVITY OF TOBACCO MOSAIC VIRUS 455 



Tliis failure to mix genetically TMV and HR-nucleic acid might Ijc attri- 

 butable to the marked genetic and structural differences between these two 

 strains. Thus, it seemed advisable to repeat this type of experiment with a 

 pair that was more closely related and yet biologically well distinguishable. 



Yellow aucuba and common TMV were selected for this purpose. Virus 

 giving symptoms characteristic of both parental forms was repeatedly 

 obtained, and proved genetically stable upon repeated passage through single 

 lesion hosts. However, the incidence of this occurrence was far too low to be 

 regarded as evidence that several subunits of nucleic acid entered into each 

 virus particle. 



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