A planted rubber tree only gives good harvest yields after 10 years. The undertaking of Leopold II started to show good yields only in the middle of the 1890s. Until then he sought compensation in his own patrimony and in loans from the Belgian state. Copy of a letter about the Congolese public debt, 1888.
NAB, Archives Hubert Droogmans, no. 3.
NAB, Archives Hubert Droogmans, no. 3.
