562 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1923 



enj<xyed their American trips, and these visits were no less appre- 

 ciated by all with whom they came in contact. 



Mrs. Kapteyn was born Catharina Elisabeth Kalshoven, and they 

 were married in 1879. Their married life was singularly happy, 

 and she has been devoted to the welfare of her husband and chil- 

 dren — two daughters and a son — Jacoba Cornelia, wife of Prof. W. 

 Noordenbos, of Amsterdam; Henriette, wife of Prof. E. Hertz- 

 sprung, of Leiden; and Gerrit Jacobus Kapteyn, who is a mining 

 engineer. 



How truly are his characteristics described by his friend Huiz- 

 enga in the Jul} 7 number of the Gids : " When the right biographer 

 for Kapteyn is found the ' Life of Kapteyn ' will be one of the most 

 beautiful books that can be written." 



