CONTENTS. 



Page. 

 Constitution of the Association i 



Tables : Past Annual Meetings : — 



Places and Dates, Presidents, Vice-Presidents and Local 



Secretaries ... ... x 



Sectional Presidents and Secretaries xii 



Evening Discourses XT- 

 DURBAN MEETING, 1921 : — 



Meetings xvii 



Officers of Local and Sectional Committees xix. 



Proceedings of Nineteenth Annual General Meeting xxii 



Report of Council, 1920-21 xxiy 



Hon. Treasurer's Report and Accounts xxvii 



Fourteenth Award of South Africa Medal and Grant xxx \l 



Association Library . , xxxiii 



Officers and Council, 1921-22 xxxviit 



President's Address : "Social Anthropology in South Africa: 

 Problems of Race and Nationality," by J. E. Duerden, 

 M.Sc, Ph. D. t 



Addresses bt Presidents of Sections : 



Section A : "Stellar Distances, Magnitudes and Move- 

 ments," by Joseph Lunt, D.Sc 32" 



Section B: "The Atomic Theory in 1921," by James Moir, 



M.A., D.Sc 47 



Section C : ' 'Some Aspects of Botany in South Africa and 

 Plant Ecology in Natal," by J. W. Bews, 

 M.A., D.Sc 63- 



Section D: "Some Recent Advances in Zoology and their 

 Relation to Present-Day Problems," by 

 H. B. Fantham, M.A., D.Sc 81 



Section E: "The Claims of the Native Question upon 

 Scientists." bv C. T. Loram, M.A., 

 LL.B., Ph.D. ... ,, ... ... 99 



Section F: "Observation and Proposals for the Stabilisa- 

 tion of Money Values," by W. A. Mac- 

 fadyen, M.A., LL.D 4 . ... ...... 110 



Public Lecture : "Land Connections between the other Con- 

 tinents and South Africa in the Past," by 

 A. L. du Toit, D.Sc , 120- 



List of Papers Read at Sectional Meetings 140 



Papers Read : — 



"Alcohol Fuels for Internal Combustion Engines," by 



W. Petchell ... 143 



"Notes on the Chemical Control of Cattle Dipping Tanks," 



by C. Williams, B.Sc. ... ... 147" 



"A Preliminary Account of Some Investigations on Leaf- 

 Aeration in certain Natal -Plants " by G. W. Gale, 

 B.Sc ... 153 



"Agricultural Experiment : Its Design and Interpreta- 

 tion," by E. Parish, B.Sc. ... 155 



"The Life-Histories of some Trematodes occurring in South 



Africa," by Annie Porter, D.Sc. ... ... 156 



"Some Parasitic Protozoa found in South Africa. IV," by 



H. B. Fantham, M.A., D.Sc .\ 164 



"A Note on Ortalia pollens Muls.," by R. H. T. P. Harris 170 



"An Educational Experiment," by H. S. Keigwin, M.A. .. 172 



"Bantu Industries," by D. A. Hunter 183' 



•'The Preservation of our National Monuments," by 



C. G. Botha ... ... 195. 



"Irving Fisher's Proposals for Stabilising the Value of 



Money," by Mabel Palmer, M.A 197 



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