Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 137-138

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 65-67

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 9-56

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 1-8

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 89-104

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 139-142

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 205-214

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 181-203

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 148-156

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 123-136

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 241-258

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 169-180

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 279-298

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 273-277

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 299-303

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 163-167

Published in Transactions of the Royal Society of South Africa, in 1914, in volume 4, issue 1, pages 231-239