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CIBA FOUNDATION SYMPOSIUM 



ON 



DRUG RESISTANCE IN 

 MICRO-ORGANISMS 



Mechanisms of Development 



Editors for the Ciba Foundation 



G. E. W. WOLSTENHOLME, O.B.E., M.A., M.B., B.Ch. 



and 



CECILIA M. O'CONNOR, B.Sc. 



With 62 Illustrations 



LITTLE, BROWN AND COMPANY 



BOSTON 



