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LIST OF PAPERS READ AT SECTIONAL MEETINGS. 



Section A. — Astronomy, Mathematics, Physics, Meteorology, Geodesy, 

 Surveying, Engineering, Architecture and Irrigation. 



MONDAY, JULY 10, 1922. 



1. Presidential Address on " The Role of Astronomy in the Development of 



Science," by M. A. Peres, D.Sc. 



TUESDAY, JULY 11. 



2. The Waterworks Department of the Antofagasta (Chili) and Bolivia 



Railway Company : R. H. Fox, A.M. Inst. W.E. 



Section B. — Chemistry, Geology, Metallurgy, Mineralogy, and 



Geography. 



TUESDAY, JULY 11. 



1. Presidential Address on " The Influence of Mineral Deposits in the 



Development of a Young Country," by E. T. Mellor, D.Sc, F.G.S., 

 M.I.M.M. 



MONDAY, JULY 10. 



2. Investigation of Different Methods of Testing Babcock Milk Bottles : 



B. J. Smit, B.A. 



3. Notes on the Chemical Control of Cattle-Dipping Tanks : C. 0. 



Williams, B.Sc, A.R.C.S. 



TUESDAY, JULY 11. 



4. * Descloizite from South-West Africa ; P. A. Wagner, Ing.D., B.Sc. 



Section C. — Botany, Bacteriology, Agriculture and Forestry. 

 WEDNESDAY, JULY 12. 



1. Presidential Address on " Carbon Assimilation," by D. Thoday, M.A. 



TUESDAY, JULY 11. 



2. The Pepper Tree (Schinus molle.) as a Cause of Hay Fever in Bloem- 



fontein : G. Potts, B.Sc, Ph.D. 



3. The Measurement of the Hydrogen Ion Concentration in South African 



Soils in relation to Plant Distribution and other Ecological Problems : 

 J. W. Bews, M.A., D.Sc, and R. D. Aitken, M.Sc 



4. The Effect of Slope Exposure upon the Climate and Vegetation of a Hill 



near Maritzburg; a preliminary investigation : R. D. Aitken, M.Sc. 



5. The Composition of Some Indigenous Grasses : A. J. Taylor, B.A., 



A.I.C. 



6. A Note on Suggested Methods of Preserving Fruits in vacuo and in 



Inert Gas : Bertha Stoneman, D.Sc. 



