Published in Transactions of the South African Philosophical Society, in 1906, in volume 16, pages 323-333

Created: 2015-07-11, modified: 2015-07-11

Published in Cape Town Transactions of the South African Philosophical Society, in 1906, in volume 16, pages 379-380

Created: 2013-01-03, modified: 2013-01-03

Published in Cape Town Transactions of the South African Philosophical Society, in 1906, in volume 16, pages 413-418

Created: 2013-01-03, modified: 2013-01-03