PREAMBLE 



Although the entire book is a memorial to Kluyver, it seemed war- 

 ranted to include a single 'In Memoriam'. The choice fell on the one 

 that appeared in the 'Nieuwe Rotterdamse Gourant' of May 15, 1956, 

 written under the immediate influence of the realization of the loss 

 that had been suffered. The present volume contains moreover a list 

 of the numerous grateful appreciations written by Dutch and foreign 

 scientists. 



Thus goes out into the world, and for the last time, a creation of 

 A. J. Kluyver that represents an impressive part of his efforts ; yet for 

 the first time it has not been supervised by his own meticulous care. 

 The compilers have ever been conscious of this regretted circumstance, 

 and they have recognised how greatly it has added to their responsi- 

 bility. 



May the reader, even of a future generation, glean from this volume 

 some of the benefits that the lustre of Kluyver's mind and personality 

 so generously bestowed upon all who knew him. 



