VI CONTENTS. 



PAGE. 



Grants for Research t6o 



Atomic structure of the Elements i6i 



The Origin of Vertebrates : W. H. Tooke |C)_ 



On true representation bv the transferable vote, and wliat it would 

 do for Southern Rhodesia: J. Brown. M.D.. CM., F.R.C.S., 



L.R.C.S.E _ .. .. T70 



Selective absorption of substances in the earth's crust : Prof E. H. 



L. ScHWARz, A.R.C.S., F.G.S i8i 



Uranium Ores ^^^ 



Notes on investigations on some South African tobaccos : M. 



LuNDiE t86 



Wireless forecasting to ships at sea iQi 



Truth among the Pragmatists ; Rev. S. R. Welch, B.A., D.D.. Ph.D. 192 



New higher oxides of nitrogen 19^ 



The occurrence and distribution of manganese in the Western Dis- 

 tricts of tlie Cape Province : W. Versfeld, B.A., B.Sc 199 



Mineral Industry in Rhodesia 202 



Agricultural Education : R. W. Thornton 203 



Mars by colour photography 208 



Grape seed oil 208 



Modern Chemistry 209 



Chemistry and crvstallographv ; a new suggestion: J. Motr, M.A., 



D.Sc, F.C.S. (Two text figures) 213 



Insect borne disease 217 



Ostrich farming in Germany 217 



The Masarwas and their language: Rev. S. S. Dorn.\n. M..'\., 



F.G.S. 2tS 



Colours of iodine solutions 225 



Canadium— a new element 225 



The latency of African Coast Fever: E. M. Jarvis, F.R.C.V.S. 



(One text figure) 226 



Mars 23T 



Transmutation of metals 231 



Some observations on atmosplieric electricity taken in South 



Africa: Prof. W. A. D. Rudge, M.A. (Two text figures) .... 232 

 The mean distances of the planets: R. T. A. Inne.s, F.R.S.E., 



F.R.A.S. .,....., -. 238 



The electro-motive series of the metals as an aid to the teaching 



of inorganic chemistrv : with special reference to the action 



of acids on metals. Prof. R. B. Dentson. D.Sc, Ph.D 245 



Le Vaillant's Grotto 252 



New derivatives of diplicnoquinone, and a new variety of 



stereoisomerism : J. INIotr, M.A., D.Sc, F.C.S 253 



Observations of atmospheric electricity at Bloemfontein : Prof. 



W. A. D. Rudge, M.A '. 262 



The sugar content of maize stalks : G. N. Blackshaw, B.Sc, F.C.S. 269 



Raditmi in Australia • 273 



Soutli African Zoology ' 273 



A preliminary list of tlie nlants of SnutluTn Rhodesia: F. Eyles. 



F.LS., M.L.C 277 



Metallin-gical operations 322 



Microkinematography 323 



The present position of tlie discussion as to the origin of the 



Zimbabwe culture : R. N. Hall, F.R.G.S 325 



Heliocentric places of the planet Jupiter : R. T. A. Innes 



F.R.S.E.. F.R.A.S. . . ' .33S 



Academy of Natural Sciences, Philadelphia t,t,() 



A contribution to our knowledge of the reproductive organs of the 



Nudibranchiata : T. F. Dri:vkr. B, A., Ph.D. (Five text fig-ures) '^40 



Comets of 191 1 -^40 



The sedimentary rocks of the Rhodesian plateau : F. P. Mennell, 



F.G.S. (One text figure) 350 



Eucrangonyx robertsl Methuen ; a blind crustacean 354 



