Contents ix 



PAGE 



Physiological adaptation of bacteria to antibiotics 



by W. KUNICKI-GOLDFINGER ..... 251 



Discussion: Alexander, Davis, Gyorffy, Knox, Kunicki- 



GoLDFiNGER, Lederberg, Slonimski, Stocker, Yudkin . 259 



Drug resistance of staphylococci with special reference to 

 penicillinase production 



by Mary Barber ....... 262 



Discussion: Barber, Bishop, Cavalli-Sforza, Davis, 

 Eagle, Hayes, Hughes, Knox, Lederberg, Pollock, 

 Pontecorvo, Westergaard ..... 274 



On the identification of genetic and non- genetic variation 

 in bacteria 



by M. Westergaard ....... 280 



Discussion: Alexander, Davis, Demerec, Hayes, Hughes, 



Knox, Lederberg, Pontecorvo, Rose, Westergaard . 290 



The reactions of the mutagenic alkylating agents with 

 proteins and nucleic acids 



by P. Alexander, Sheila F. Cousens and K. A. Stagey 294 



Discussion: Alexander, Davis, Hayes, Lederberg, Ponte- 

 corvo, Rose, Walker, Westergaard . . . .318 



Genetics of two different mechanisms of resistance to 

 colicins: resistance by loss of specific receptors and im- 

 munity by transfer of colicinogenic factors 



by P. Fredericq ....... 323 



Discussion : Cavalli-Sforza, Fredericq, Hayes, Lederberg, 



Pollock, Pontecorvo, Stocker ..... 335 



General Discussion: Davis, Dean, Hayes, Hotchkiss, 



Lederberg, Pollock, Slonimski .... 339 



Chairman's closing remarks 



Sir Charles Harington ...... 344 



