CONTENTS. ^^^ 



Papers Read {continued) : — 



PAGE 



" Magnesia Impregnated Soils," by G. N. Blacksliaw, 



O.B.E., B.Sc, F.I.C. ... ... 171 



'• Note on Kimberlite from the Belgian Congo/"' by P. A. 



Wagner, Ing. D., B.Sc. ... ... ... ... 179 



" Constituents of the Flora of Southern Rhodesia," by 



F. Eyles ... ... ... ... ... ... 181 



" Additional Host-plauts of Loranthaceae occurring 

 around Durban," bv Paul A. van der Bijl, M.A., D.Sc, 

 F.L.S. ... "... ... ... ... ... 185 



•■ Note on the Crassulaceac found in Rhodesia," by 



S. Schonland, M.A., Ph.D. ... ... ... ... 186 



" Ripening of Seed in (Inetum gncnom and Gnetum 



africaniim/' by Mary G. Thoday ... ... ... 189 



•■ A note on Dasychira extorta and its Lepidopterous 



Parasite," by C. P. van der Merwe ... ... ... 192 



" Birds and Insects in Bushman Folk-lore," by D. F. Bleek 194 



'' A Tachinid Parasite of the Honey Bee," by S. H. Skaife, 



M.A., M.Sc. ... ... ... ... ... 196 



■• Agricultural Economics — Cost of Production of Maize," 



by R. A. Lehfeldt, D.Sc. ... ... ... ... 201 



•' Calibration of Gerber Milk Butyrometers," by C O. 



Williams, B.Sc, A.R.C.S. ... " ... ... ... 205 



" Note on Rock-gravings at Metsang, Bechuanaland Pro- 

 tectorate," by A. J. C. Molyneux, F.G.S. ... ... 200 



'■ Some Features of the Religion of the Ba-Venda," by 



Rev. H. A. Junod ^ ... ... ... ... 207 



■•The Occurrence of ' Terlilanz ' (Faurea Macnaughtonii, 

 Phill.) in Natal and Pondoland," by E. P. Phillips, 

 M.A., D.Sc, F.L.S., and J. J. Kotze, B.A., D.Sc. ... 221 



■• A Method of Veld Estimation," by A. O. D. Mogg, B.A. 222 



" Note on a Diagram showing the amount of Available 

 Sunshine falling on a Horizontal Surface on any Day 

 of the Year at a Given Place, and showing also the 

 Sun's Elevation and its Times of Rising and Setting," 

 by J. T. Morrison, M.A., B.Sc, F.R.S.E. ... ... 227 



" Note on Older Palaeolithic Implements from the Umguza 

 and Bembesi Vallevs," bv A. W. Macgregor, B.A., 

 F.G.S. ... .:. ■ ... ... ... . . 230 



" The Effect of Elevation of Temperature and Altitude of 

 Aerodrome in the Taking-off of Aeroplanes," by P. G. 

 Gundry, B.Sc., Ph.D., F.R.Ae.S. ... ... ... 235 



'• Karroo Rocks in the Mafungabusi, Southern Rhodesia," 



by A. J. C. Molyneux, F.G.S. ... ... ... 249 



" On the Volumetric Determination of Phosphoric Oxide," 



by B. de C. Marchand, B.A., D.Sc ... ... ... 259 



" Some Further Factors influencing the Solubility of 

 Phosphoric Oxide in Mixed Fertilisers containing 

 Superphosphates," by Edmund Victor Flack ... 268 



■■ South African Fern Notes, with List of Ferns and Fern- 

 Allies found in Southern Rhodesia, and of Additional 

 Species recorded for other South African Phytographic 

 Areas," by T. R. Sim, D.Sc, F.L.S. ... ... 275 



" The Leaves of Ilakea pectinata and H. stiaveolens," by 



Horace A. Wager, A.R.C.Sc ... ... ... 284 



" Note on the I-Kowe or Natal Kafir Mirshroom, Schiilzcria 

 Umkoicaan,'' by Paul A. van der Biil, M.A., D.Sc, 

 F.L.S. ... ■ 286 



"A Paw-Paw Leaf-Soot caused by a Phyllnsticta sp.," by 



Paul A. van der Bijl, M.A., D.Sc, F.L.S. ... ... 288 



" An Exhibit of Stone Implements from Tiger Kloof and 



Taungs, Cape Colony," by Rev. Neville Jones, F.E.S. 290 



" .Some Factors in the Natural Control of the Wattle 



Bagworm," by S. H. Skaife, M.A., M.Sc. ... ... 291 



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