THE TRADES SCHOOL IN THE TRANSVAAL. 



369 



21. " The Problems of Coloured Labour." The State for June, 



1911. 

 "The Coloured Menace." Rand Daily Mail, lyii. 

 "Report: Transvaal Indigency Commission," page 44, para- 

 graph 81. 



22. Ibid., pages 78-79, paragragh 139. 



23. Ibid., page St,, paragraph 154. 



24. Ibid., page 81, paragraph 184 and Ap. 3. 



25. Ibid., page 82, paragraph 150. 



26. Ibid., page 121, paragraph 231. 



27. Ibid., page 109, paragraph 208. 



28. Ibid., page 62, paragraph iii. 



29. Ibid., page 23, paragraph 112. 



30. Ibid., page 63, paragraph 67. 



31. Ibid., page 36, paragraph 68. 



32. Ibid., page 117, paragraph 22;^. 



33. Ibid., page 185, paragraph 376. 



34. Ibid., pages 15-28,29. 



35. Ibid., page 97, paragraph 180. 



36. Ibid., page 35, paragraph 67. 



37. Ibid., page 191, paragraph 392. 



38. Ibid., page 56, paragraph 103. 



39. Ibid., page 190, paragraph 395. 



40. Ibid., page 56, paragraph 103. 



TRANSACTIONS OF SOCIETIES. 



Chemical, Metallurgical and Mining Society of South Africa. — 

 Saturday, April i8tli : A. Richardson, M.I.M.M., President, in the chair. — 

 "The Witzuatersmnd earth tremors": H. E. Wood. In 1908, interest in 

 seismology was aroused in South Africa owing to the occun-ence of a con- 

 tinued series of small earthquake shocks or local tremors over the Wit- 

 witwatersrand. During 1908 and suhsequently. up to March, 1914, in all 171 

 of these shocks had heen experienced. The view was expressed that tliese 

 were semi-artificial in origin, and caused by the extraction of large amounts 

 of rock and water from comparatively small depths beneath the surface. 

 This view is confirmed by taking into account the circumstances under 

 which similar tremors have been known to occur hi Sunderland, in the 

 Rhondda Valley, and in Germany. Seismologically the author considers 

 South Africa to be stable, with the exception of four distinct regions of 

 instability : the southern part of the Orange Free State, along tlie Cape 

 border ; the Rustenburg and Zoutpansberg districts in the Transvaal ; and 

 the eastern slopes of the Drakensberg Mountains. 



Saturday, May i6th : A. Richardson, M.I.M.M., President, in the 

 chair. — "Notes on hydraulic classiHers and classification" : Prof. G. H. 

 Stanley. The author described a series of experiments undertaken with 

 the object of ascertaining more definitely the causes of discrepancy 

 between theory and practice in the sorting out of mineral particles of 

 different sizes and specific gravity by hydraulic agency, and of overcoming, 

 as far as possible the causes of imperfect classification. — -" Rock tcmfyera- 

 tures" : E. J. Moynihan. The author criticised the data of Whitehouse 

 and Wotherspoon abstracted in a previous volume,* according to which 



* 1910 Report, Capetown, p. 374. 



