14 F. M. BURNET AND W. M. STANLEY 



the ways by which virus protein is synthesized, but any generalizations pro- 

 pounded at a biochemical level must be looked at very carefully in the light 

 of facts about adaptive enzymes, of protein synthesis in glandular cells, and 

 a dozen other situations. It is equally possible that useful generalizations may 

 be suggested, not at the biochemical but at the genetic level. Then, having due 

 regard to differences in the systems being compared, what is suggested must 

 not be at variance ^\'ith what is accepted as covering all other genetic systems. 

 In our opinion there is no possibility, even in principle, of producing a 

 complete account of what happens when a virus invades and multiplies 

 within a susceptible cell. Each chapter, each review must be something of a 

 work of art as well as of logic. Basically the problem is to select from the 

 available studies those facts and interpretations which help best toward 

 understanding — ^understanding bemg used at the pragmatic level of some- 

 thing that will facihtate the rapid and effective marshalling of knowledge 

 needed for some human purpose, whether practical or academic. 



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