Report SA.A. Advaxckmknt of Science. 



I'AC;K 



a. Note en Solar x\ctivity, 1907, Uy H. D. Baclccck, M.A., 



M.Inst.C.E, F.K.A.S. ... ... ... ... 36 



4. The Treatment of Electrodynanucs. by 11. A. Lehfeldt, D.Sc. 37 



5. Report on the Result.s of a Magnetic Survey of the Clan- 



williani. Van Rhynsdorp and Cahinia Districts, by 



J. C. Beattie, D.Sc. ... ... ... ... 42 



0. C>n a Magnetic Disturhance in the Soutli-East of Cape 



Colony, l.v .T. C. Beattie, D.Sc. (with 3 charts) ... 43 



SECTIONS B and C. 



1. PresidentiaJ Address, by E. H. L. Schwarz, A.R.C.S., 



F.G.S. (with portrait of the late Dr. W. G. Atherstone) 41^ 



2. Some Recent Views on tlie Subject of Mine V^entilation, by 



W. Cullen ... ... ... ... ... 6cV 



3. Some Notes upon the Application of Reinforced Concrete, 



by Frank AV. Waldron, A.]\[.I.C.E. ... ... ... fi7 



4. The New Waterworks for Port Elizabeth, South Africa, by 



W. Ingham, M.I.C.E., M.I.M.E. ... ... ... 74 



5. Some Notes on Irrigation in Cape Colony, by W. A. Legg, 



M.I. C.E. (with 4 diagrams) ... ... ... 7(> 



0. Investigations into the Physical Composition of .some Cape 



Colony Soils, ])y Charles F. Juritz, M.A., D.Sc, F.T.C.... 87 



7. Notes on .some Diamond-bearing aufl Associated Rocks, by 



F. P. Mennell, F.G.S. ... ... ... ... 105 



f<. On the CV)rrelation of the Karroo System in Rliodesia, by 



A. J. C. Molyi.cii.x, F.G.S. ... ... ... 107 



9. Intluence of Forests on Natural N\'ater-Supi>Iy, by C. I>. H. 



Braine, A.M.T.C.E. ... ... ... ... Ill 



10. Some Notes on L'ndfrground Water, bv A. I ). Tiidliope ... 13."> 



11. The T)estruction of Mountain N'egetation : its Etlects upon 



the Agricultural Conditions in the Valleys, by F. E. 



Kanthack, A.M.I.C.E. (/i//.- f//////) ... ... ... 13» 



1--'. Irrigation, by C. K. Lawford (/iV/r r»/////) ... 139 



!.■{. The Stadia Method applied to Minor Kjigineering Surveys, 



\>\ T. W. Fevvy {fif/>' ouhj) ... ... ... 1.3i> 



