Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 25-37

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 39-43

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 45-51

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 61-63

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 65-194

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 225-236

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 237-245

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 247-258

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 273-523

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 524-564

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 565-570

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 575-591

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 593-598

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 599-602

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 603-604

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 605-636

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 637-646

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 653-657

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 669-670

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 685-694

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 695-701

Published in Transactions of the Royal Society of South Africa, in 1915, in volume 5, issue 1, pages 713-750