XIII 



A UNIVERSE OF MIND-STUFF 



THE author of these two remarkable 

 volumes l died last March in the island 

 of Madeira, at the early age of thirty- 

 three, the victim, apparently, of what is called 

 "overwork," that is, of work long pursued 

 in utter disregard of the necessary limitations 

 and imperative requirements of the human sys- 

 tem. Never, perhaps, has the demon of over- 

 work carried off a more illustrious victim. 

 Never, perhaps, has it been more strikingly 

 shown of how little avail is the mere knowledge 

 of hygiene in insuring obedience to its precepts. 

 No one understood better than Clifford what 

 are popularly known as the laws of health ; no 

 one had fathomed more deeply or discussed 

 more lucidly the dependence of the mind upon 

 the body ; no one in our time has been better 

 able to apply in the physiological domain the 

 most accurate and definite conceptions of the 

 relations of energy to work. Yet from all I 



1 Lectures and Essays. By the late William Kingdom Clif- 

 ford, F. R. S. Edited by Leslie Stephen and Frederick Pol- 

 lock. 2 vols. 8vo. London: Macmillan & Co. 1879. 

 292 



