On the first page of the book is a postcard at the front is a photograph of Lou Salomé, Paul Rée and Friedrich Nietzsche. 
On the backside is written:
'Ik ben wat te laat in Amsterdam vanwege een uitgelopen "Nietzsche-studie". 
Groeten van Jan'

(In different handwriting)
'Dit is nu de Lou Salomé waar Nietzsche verliefd op was. Paul Rée is de rivaal! Groeten Betty'

Address:
'Adèle van Rijckevorsel en Constant
van Alkemadelaan 53
2597AB
's-Gravenhage
Holland'

The year of publication was not printed in the book but has been found online.