PKEFACE XV11 



volumes is concerned with the properties of one plant virus (TMV), one 

 bacterial virus (T2) and three animal viruses (vaccinia, influenza A, and 

 poliomyelitis viruses). There are large numbers of other viruses in each 

 of the main categories and undoubtedly many show or will show highly 

 significant differences in behavior from those which for one reason or another 

 have been chosen as prototypes. Perhaps one of the important functions of 

 the work will be to show where such significant differences can most hopefully 

 be looked for. Clearly there is no lack of scope for further work in virology. 



Melbourne, Australia F. M. Burnet 



Berkeley, California Wendell M. Stanley 



December, 1958 



