been a leader for fifty years. He died suddenly of a heart attack, in 

 the midst of active work on 21 March 1947. 



Barcroft published three to four hundred original papers and several 

 text books, including two classics, The Respiratory Function of the Blood 

 and Features in the Architecture of Physiological Function. It is un- 

 necessary here to refer to his personal qualities, as these are reflected 

 so clearly in the tributes given in the first section of this book. 



In 1903 he married Mary Agnetta (Minnie) Ball, a daughter of the 

 famous astronomer Sir Robert Ball. She survives him with two sons, 

 Henry (now Professor of Physiology at St. Thomas's Hospital, London) 

 and Lieut-Col. Robert Ball Barcroft. 



F. J. W. R. 



xu 



