OF THE

Twenty-first Annual Meeting

OF THE

South African Association

FOR THE ADVANCEMENT OF SCIENCE,

BEING VOLUME XX OF THE

SOUTH AFRICAN JOURNAL OF SCIENCE.

BLOEMFONTEIN

1923

JULY 9-14

JOHANNESBURG:

PUBLISHED BY THE ASSOCIATION.

1923.

TABLES PAST ANNUAL MEETINGS :-

Places and Dates, Presidents, Vice-Presidents and Local

Secretaries

Sectional Presidents and Secretaries

11

111

LIST OF PAPERS READ at Sectional Meetings

66

PRESIDENT'S ADDRESS: The South African Seas," by Professor

J. D. F. Gilchrist, M. A., D.Sc., Ph.D.

ADDRESSES BY PRESIDENTS OF SECTIONS:

Section A: The Structure of the Atom," by Professor W. H.

Logeman, M. A.

Section B: Twenty Years of Chemical Progress in South

Africa," by A. Stead, B.Sc.

Section C: The Search for Crucial Instances in Botanical

Procedure," by Professor Bertha Stoneman, D.Sc.

Section D: Remarks on the Distribution of Animals in South

Africa," by J. Hewitt, B.A.

The Methods of

Ethnology and

Social

Anthropology." by Professor A. R. Radcliffe Brown, M. A.

Section E:

Section F:

Retarded

and Defective

Children:

Native

Mentality: Mental Testing," by J. T. Dunston, M.D.

PAPERS READ AND PUBLISHED :-

· On

new Germanium

Spectrographic Analysis of the

a

Gallium Mineral Germanite.' by J. Lunt. D.Sc.

Seasonal Weather Forecasts." by G. W. Cox, F.R.Met.S.

A Résumé of the Drought Problem in the Union of South
Africa," by R. J. van Reenen, B.A., A.M.L.C.E.

Drought in the South-West Cape," by Professor R. H.

Compton, M.A.

The Plant Succession in the Orange Free State, and the Need

for Maintaining a Covering of Vegetation," by Professor

G. Potts, Ph.D.

Criticisms and Suggestions regarding Drought in South

Africa," by Professor J. W. Bews, M.A.. D.Sc.

Erosion, especially Surface-washing, in Southern Rhodesia."

by A. C. Jennings, A.M.I.C.E.

The Kalahari Scheme as the Solution of the South African

Drought Problem," by Professor E. H. L.

A.R.C.S.

797731

1

28

39

74

96

124

148

157

166

178

193

196

202

204

Schwarz,

208

PAPERS READ AND PUBLISHED (Continued) :—

The Chromite of the Bushveld Igneous Complex," by P. A.

Wagner, D.Sc., D.Eng.

The Reciprocal Salt-Pair 2 NaCl + Ca (NO),

=

2 NaNo

+ CaCI," by A. J. Pelling, D.S.O., B.Sc., and J. B.

Robertson, M.A., B.Sc.

The Disaggregation of some Rock and Soil-forming Minerals,"

by Wm. Torrance

Preliminary Chemical Investigations of Three South African

Plants," by I. P. J. du Plessis, M.Sc.

Comparative Determinations of the Lime Requirements of

Soils by Different Methods," by T. D. Hall, B.A., M.Sc.

The Toxic Principles of Adenia digitata,' by Professor

H. H. Green, D.Sc., and Professor W. H. Andrews, D.Sc..

M.R.C.V.S.

A Bacterium Decomposing Nicotin,' by Professor H. H.

Green, D.Sc., and Ida Lonstein, B.Sc.

Note on the Effect of Varying the Quantity of Nitric Acid

in determining PO, by the Molybdate Method," by J. P.

van Zyl, B.A., Ph.D.

Researches on the Vegetation of Natal," by Professor J. W.

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

223

236

241

256

265

273

274

275

285

Notes on the Evolution of Plant Growth Forms," by Professor

J. W. Bews, M.A., D.Sc.

290

A Note on the Flora of Salisbury Island (Durban Bay),” by

Helena M. L. Forbes

Notes on South African Ferns and Rhodesian Mosses," by

T. R. Sim, D.Sc., F.L.S.

304

309

The Relative Economy of Ox Labour in South African

Farming," by E. Parish, B.Sc.

316

Outline of the Floral Regions of Zululand," by H. H.

Curson, M.R.C.V.S.

323

44

A Note on the Life-histories of Ascaris lumbricoides and

Ascaris suilla in South Africa," by Annie Porter, D.Sc.,

F.L.S.

347

Occasional Hosts of some South African Trematodes," by

F. G. Cawston, M.D.

The Pelvic Girdle in the Snake, Glauconia," by Professor

J. E. Duerden, M.Sc., Ph.D., and R. Essex, B.Sc.

Methods of Evolution," by Professor J. E. Duerden, M.Sc..

Ph.D.

Kemp Fibres in the Merino Sheep," by Professor J. E.

Duerden, M.Sc., Ph.D., and Miss M. Ritchie, B.Sc.

Variations in Body Temperatures observed in Normal Sub-

jects," by Professor E. H. Cluver, M.A., M.D.

"A Note on Pancreatic Calculi in the Ox," by Professor R.

W. M. Mettam, M.Sc., M.R.C.V.S.

An Abnormality of the Omasum of an Ox," by Professor

R. W. M. Mettam, M.Sc., M.R.C.V.S.

"An Abnormality of the Right Cardiac Atrium of the Horse,"

by Professor R. W. M. Mettam, M.Sc., M.R.C.V.S.

New Formations in the Duodenal Mesentery and Stomach

Wall of Bufo regularis Reuss," by Professor E. Warren,

D.Sc.

392

396

the

406

The Application of the Conglutination Reaction to

Serum Diagnosis of Bovine Pleuro-pneumonia (Lung

sickness)," by James Walker, M.R.C.V.S.

A Note on the Cultivation of Flagellates of the Trypano-

soma theileri type from the Blood of South African

Cattle," by E. M. Robinson, D. Med. Vet., M.R.C.V.S.

Some Protozoa found in Certain South African Soils-III."

by Professor H. B. Fantham, M.A.. D.Sc.. and Miss

Nellie F. Paterson, M.Sc.

432

437

351

354

357

366

380

387

390

PAPERS READ AND PUBLISHED (Continued): :-

Some Parasitic Protozoa found in South Africa -VI," by

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

The Bushmen of the Zuurberg," by F. W. FitzSimons

Divination and Divining Bones," by Rev. S. S. Dornan, M.A.

Initiation Rites for Girls in the Masiyeni District, Portu-

guese East Africa," by Miss E. Dora Earthy

The Expression of the Social Value of Water among the

Naman of South-West Africa," by Mrs. R. F. A.

Hoernlé, B.A.

The Cash Value of Native Education," by W. C. Atkins,

M.Sc.

493-

501

504

512

514

527

The Cliff Dwellers of Zitzikama," by F. W. Fitz Simons

The Psychology of Autosuggestion, by Professor T. M.

Forsyth, M.A., D.Phil.

541

545

Prices in the Eighteenth Century," by C. Graham Botha

Wages, Profits, Surpluses and Pools," by Mabel Atkinson,

M.A.

Some Lessons from the Unconscious: The Meeting-Place of

Psychology and Philosophy," by F. S. Livie-Noble

The Dispersion of the Stock Farmer in Cape Colony in the

Eighteenth Century," by C. Graham Botha

An Unconscious Seventeenth Century Economist: Jean de la

Fontaine," by Professor R. D. Nauta

552

555

563

574

581

XVII-Kemp Fibres in the Merino Sheep

378

378

379

379

XVIII-Bufo regularis Reuss, Origin of Blood Corpuscles, Tumour

XIX-Bufo regularis Reuss, Tumours from Arthropod Bristles.

404

Nematode, Echinorhynchus, Cestode

405

436

436

503

XXIII-Cliff Dwellers of Zitzikama

XXIV-Cliff Dwellers of Zitzikama

544

544

ERRATUM.

Page xix, line 2, for 1922 read 1923.

The attention of Members of the Association and other readers is directed to the fact that the Council of the Association has decided to issue Volume XX of the JOURNAL in two parts.

Attention is also drawn to the revised Constitution and By-Laws passed at the Annual Meeting at Bloemfontein, 1923.

Information regarding the activities of the Association, its previous Reports, and the cost of back numbers can be obtained from the Assistant General Secretary, P.O. Box 6894, Johannesburg, Transvaal.

H B. F.