Field of study: Dierkunde, Ontleedkunde, Zoology

• Haematopoiesis in the placenta of Tarsius and other mammals
  KNAW, Proceedings, 1, 1898-1899, Amsterdam, 1899, pp. 167-170
  
  
• On the formation of red blood-corpuscles in the placenta of the flying maki.(Galeopithecus)
  KNAW, Proceedings, 9 II, 1906-1907, Amsterdam, 1907, pp. 873-878
  
  
• On the Gastrulation and the formation of the Mesoblast in Mammals
  KNAW, Proceedings, 4, 1901-1902, Amsterdam, 1902, pp. 161-161
  
  
• On the relationship of various invertebrate phyla
  KNAW, Proceedings, 6, 1903-1904, Amsterdam, 1904, pp. 839-846
  
  
• The Eutherian and the Metaherian early blastocyst
  KNAW, Proceedings, 13 II, 1910-1911, Amsterdam, 1911, pp. 1077-1083