APOLOGY 



As Kluyver would have insisted, we have endeavoured to spare no 

 efforts on the composition and appearance of this book. With much 

 understanding of the nature of our undertaking, Mrs. G. M. Pot- 

 Van Regteren Altena in Schoorl arranged the design. We wish to 

 thank Paul Huf for the frontispiece and for photograph 22, and 

 particularly for the suggestions for the lay out of the photographic 

 section. Publication and printing were in the hands of the North- 

 Holland Publishing Co., Amsterdam, and of the printing establish- 

 ment of Meinema, Delft, respectively. Kluyver used to speak highly 

 of both these firms. 



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