PI. II 



^ 



Martinus Beijerinck (1718-1782); 

 great-grandfather of the scientist. 



Frederik Beijerinck (1766-1838); 

 grandfather of the scientist. 



Derk Beijerinck (1805-1879); 

 father of the scientist. 



Jeannette Henriëtte van Slogteren 

 (1811-1875); mother of the scientist. 



