Hugo R.
Kruyt

Utrecht




Carl Ernst Heinrich
Schmidt

Kaiserliche Universität Dorpat


Arthur Joachim
von Oettingen

Kaiserliche Universität Dorpat (Meteorology Tree)


Wilhelm
Wundt

University of Leipzig (Neurotree)


Wilhelm Friedrich
Ostwald

Leipzig University


?




Diederik Johannes
Korteweg

Amsterdam (MathTree)


Johan Antony
Barrau

Utrecht (MathTree)


Paul
Ehrenfest

Leiden (Physics Tree)


Dirk
Coster

RUG (Physics Tree)


Jan Albert
Prins

Delft University of Technology (Physics Tree)


Oskar
Piloty

University of Munich


Wilhelm
Schlenk

Vienna University, Berlin


Herman F.
Mark

Polytechnic University


Jan J.
Hermans

UNC Chapel Hill






Hugo R.
Kruyt

Utrecht





Wim
Dorst

Leiden
(Options)

Wim DorstX