Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 55-56

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 33-34

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 49-53

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 35-39

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 57-59

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 75-80

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 113-147

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 159-164

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 81-88

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 151-157

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 65-74

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 99-111

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 181-200

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 213-232

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 267-272

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 253-266

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 41-48

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 233-237

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 299-307

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 273-279

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 289-298

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 281-288

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 27-31

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 245-251

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 201-212

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 89-93

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 239-244

Published in Transactions of the Royal Society of South Africa, in 1922, in volume 10, issue 1, pages 95-98