u<rr 



ELECTRONIC APPARATUS^ 7 



FOR 



BIOLOGICAL RESEARCH 



P. E. K. DONALDSON, M.A. 



with contributions by 



J. W. L. Beament, M.A., Ph.D. 



F. W. Campbell, M.A. 



D. W. Kennard, M.B., B.S., M.R.C.S., L.R.C.P., Ph.D 



R. D. Keynes, M.A., Ph.D. 



K. E. Machin, M.A., Ph.D., A.M.I.E.E. 



I. A. Silver, M.A., Ph.D., M.R.C.V.S. 



<^OLOGICA/ ,;^ 



^' 



P, 



^• 



W 





^ WOODS HO'.E. MA ^^ 



LfBRARY 



LIBRARY 



gi^.S. DEPT. OF COMMERCE 

 NMFS-NEFC 



>, 



O 



o. 



H< 



NEW YORK 

 ACADEMIC PRESS INC., PUBLISHERS 



LONDON 

 BUTTERWORTHS SCIENTIFIC PUBLICATIONS 



1958 



