Abstract
DR. EscLIE VAN RIJCKEVORSEL, who died on Oct. 18 last at the age of eighty-three years, was born at Rotterdam. After leaving the gymnasium there he went to the Polytechnic at Zurich and the University of Bonn, taking his doctor's degree in physics and mathematics at Utrecht in 1872. Soon afterwards he proposed to Prof. Buys Ballot a magnetic survey of the East Indian Archipelago at his own expense, only the instruments being provided by the Dutch Government. After a training at the observatories at Kew and Munich, he left for Java in December 1873, and largely extended Elliott's first survey of 1846–49, taking observations at more than a hundred stations. In spite of interruption by malarial fever, a similar survey was carried out in eastern Brasil between 1882 and 1885, with the assistance of E. Engelenburg.
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