CONTENTS. 



Page 

 Constitution of the Association ... ... ••• •■• i 



Tables : Past Annual Meetings : — 



Places and Dates, Presidents, Vice-Presidents and Local 



Secretaries ... ••• ••■ ••• ••• ^^ 



Sectional Presidents and Secretaries ... ... ... xi 



Evening Discourses ... ... •■• ■•• ■•■ siv 



BULAWAYO MEETING, 1920: — 



Meetings ... ••• ••• ••• ••• •■• ^^^ 



Officers of Local and Sectional Committees ... •.- xvii 



Proceedings of Eighteenth Annual General Meeting ... xx 



Report of Council, 1919-20 ... ... .■■ ■■• xxiii 



Hon. Treasurer's Report and Accounts ... ... ... xxvi 



Thirteenth Award of the South Africa Medal and Grant ... xx.x 



Association Library ... ... ... ••• •■■ xxxiii 



Officers and Council, 1920-21 ... ... ... ... xxxviii 



President's Address : " The Veld, its Resources and Dangers," 



by I. B. Pole Evans, M.A., D.Sc, F.L.S. ... ... 1 



Addresses by Presidents of Sections : 



Section A: "Recent Progress in Astronomy," by H. E. 



Wood, M.Sc, F.R.A.S., F.R.Met.S. ... ... ... 35 



Section B; '-'Geology in Relation to Mining," by F. P. 



Mennell, F.G.S., M.I.M.M. ... ... ... ... 43 



Section C: "Causes leading toward Progressive Evolution of 



the Flora of South Africa," by T. R. Sim, D.Sc, F.L.S. 51 



Section D : "Some Zoological Factors in the Economic 

 Development of South Africa," by C. W. Mally, M.Sc, 

 F.E.S. ... ... ... ... ... ... 64 



Section E: "The Magic Conception of Nature amongst 



Bantus," by Rev. Henri A. Junod ... ... ... 76 



Section F : " Laljour Conditions in South Africa," by 



R. A. Lehfeldt, B.A., D.Sc. ... ... ... 85 



Public Lecture : " The Nitrogen Problem," by J. A. W'Ikinson, 



M.A. ... ... ... ... ... ... 95 



List of Papers Rkad at the Sectional Meetings ... ... . 110 



Papers Read : — 



" The Geological Section between Bulawayo and the 



Victoria Falls," by H. B. Maufe, B.A. ... ... 113 



" Crime and Feeble-mindedness," by G. T. Morice, K.C., 



B.A 116 



" The Distribution of Accessory Food Factors (Vitamines) 



in Plants," by E. Marion Delf, D.Sc, F.L.S. ... ... 121 



" The Life-history of the African Sheep and Cattle Fluke, 



Fasciola gigantica,'^ by Annie Porter, D.Sc, F.L.S., 



F.R.S. (S.A.) 126 



" Some Parasitic Protozoa found in South Africa. — III.," 



by H. B. Fantham, M.A. (Cantab.), D.Sc (Lond.). ... 131 



" The Future of the Native Races of Southern Rhodesia," 



by N. H. Wilson ... ... ... ... ... 1-36 



" A Short Note on Einstein's Planetary Equation," by 



W. N. Roseveare, M.A. ... ... ... ... 151 



E. H. Adlinglon. Ltd.. Printers, Johannesburg.— 5942. 



