62
4 Observator and Professor
Fig. 4.10 Catharina Elisabeth Kalshoven before her marriage to Jacobus Cornelius
Kapteyn. This picture comes from Henriette Hertzsprung–Kapteyn’s biography [1]
Kapteyn and the Kalshoven family together and William Burck was one of
Kapteyn’s bests friends from Leiden. The name van den Broeke has not been
encountered before. He turns out to be the husband of Elisabeth Henriette
Andreé Wiltens (1846–1940), the elder half-sister of Kapteyn’s great friend
from Utrecht, Willy Andreé Wiltens. Kapteyn probably had wanted to ask his
4 Observator and Professor
Fig. 4.10 Catharina Elisabeth Kalshoven before her marriage to Jacobus Cornelius
Kapteyn. This picture comes from Henriette Hertzsprung–Kapteyn’s biography [1]
Kapteyn and the Kalshoven family together and William Burck was one of
Kapteyn’s bests friends from Leiden. The name van den Broeke has not been
encountered before. He turns out to be the husband of Elisabeth Henriette
Andreé Wiltens (1846–1940), the elder half-sister of Kapteyn’s great friend
from Utrecht, Willy Andreé Wiltens. Kapteyn probably had wanted to ask his