x PREFACE 



properties in protoplasm is of the greatest assistance 

 to the logical perfection of our conceptions regarding 

 the modus operandi of the activities of living matter. 



Not that I pretend to have got behind molecular 

 structure or disposition the ultimate inscrutable 

 of biology as of physics, but I hold that by postu- 

 lating a second fundamental property as residing 

 in the biogenic complex and contributing to its 

 functional complexity, we are afforded a fuller 

 insight than we have at present into what one 

 might call the " true inwardness " of living matter. 



[I must here take the opportunity of acknow- 

 ledging with gratitude the financial assistance I 

 have received from the Carnegie Trust for the 

 Universities of Scotland, in carrying out the ex- 

 perimental work partly described in chap. ii. 

 Certain expenses connected with the publication 

 of these results in the present volume have also 

 been met through the liberality of the Trust.] 



D. F. H. 



THE UNIVERSITY, ST. ANDREWS, 

 October 1907. 



