472 e, a. evans, jr. 



Addendum 



Since the completion of this review, several additional and important 

 observations concerning the chemistry of the bacterial viruses have been 

 rejjorted. Ames et al. (1958) have shown the presence in phage T4 of the 

 polyamines, putrescine, and spermidine in quantities sufficient to neutralize 

 much of the viral DNA. However, with the salmonella phages PLT-22 and 

 98, spermine was present with little or no putrescine and spermidine. Also, 

 Kozloff and Lute (1958) have demonstrated the presence of small quantities 

 of ATP and deoxyATP in phage T2, presumably in association with the 

 contractile protein described in Section III, B, 2. 



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