THE 



MYSTERY OF LIFE 



AN ESSAY 



IN REPLY TO 



DR. GULL'S ATTACK ON THE THEORY OF VITALITY 



\ 



IN HIS 



HARVEIAN ORATION FOR 1870. 



LIONEL S. BEALE, M.B., F.R.S., 



Felloiv of the Royal College of Physicians; Physician to King's College Hospital, 



and formerly Professor of Physiology and of General and Morbid 



Anatomy in King's College, London. 



WITH TWO COLOURED PLATES. 



LONDON: 



J. & A. CHURCHILL, NEW BURLINGTON STREET. 



PHILADELPHIA, LINDSAY AND BLAKISTON. 



1871. 



[All rig/its resewed,] 



