List of sources:
British 1820 Settlers to South Africa. Transcribed marriage entries for Pillans. https://www.1820settlers.com/genealogy/settlerbrowsemarrs.php?name=PILLANS as on 1 May 2020.
Cape of Good Hope. Report of the Meteorological Commission, 1893, 1895.
Cape of Good Hope. Report of the trustees of the South African Museum, 1898, 1899.
FamilySearch: Charles Roland Pillans. https://www.familysearch.org/ark:/61903/3:1:3Q9M-C91Q-XSTK-H?view=index&personArk=/ark:/61903/1:1:QG5W-RGVB&action=view&cc=2517051&lang=en&groupId=
General directory and guide-book to the Cape of Good Hope and its dependencies, 1886, Suburban directory.
Heese, J.A. South African genealogies. Pretoria and Stellenbosch, 1986-2005.
History of meteorology in South Africa. Weather Bureau Newsletter (Centenary issue), 1960, No. 139, pp. 1-48.
Robertson, H. Collectors of insects and arachnids in Africa. http://www.museums.org.za/bio/people/ as on 26 April 2001.
Stewart, C.M. Meteorology in South Africa - a retrospect and prospect. Report of the South African Association for the Advancement of Science, 1903, pp. 63-74.