LIST OF PAPERS READ AT THE SECTIONAL 



MEETINGS. 



Section A.— Astronomy. Matiiematics. Physics, Mlteoro- 



LOGY, (iEODESV, SURVEYING, ENGINEERING, ARCHITEC- 

 TURE, AND iRRrf.ATION. 



MONDAY. JULY 2. 



1. Address by Prrif. W. N. Roskveare, M.A., President of the Section. 



TUESDAY, JULY 3. 



2. Tonisatidn of gases and the al)Sor])tion of X-ra\s: L. Simons, B.Sc. 

 .1. Paralla.v of the faint proper motion star near Alpha of Centaurus : 



R. T. A. Inni:s. F.R. \.S., F.R.S.E. 



WEDNESDAY. JULY 4. 



4. Some problems in terrestrial physics that require attention from 



South African phvsicists : Prof. J. T. Morrison, ]\I.A.. B.Sc, 

 F.R.S.E. 



5. The scope of radiology : J. S. v.\n dek Lingen, B.A. 



THURSDAY, JULY 5. 



6. An electric \chicle charging plant: J. W. Kikkeanh. M..\m.I.rLE. 



7. The ])lonoh: W. S. H. CeeV;hokne. l^Sc, .\.M.I.l\lechT':. 



8. Mechanical refrigerators: \\. W. ]!l'el. 



9. The effect of vegetation on the rainfall of .South Africa: 11. Pealing, 



M.Sc. 



.^ECTif)N !•). — C■|lE^^lSTK^•, (iKor.dCN, .Met \I.l.^■K(;^•, M 1 ,\ek.\logy, 



.AND ( iloOGR.M'IIY. 



TUESDAY, JULY 3. 



T. Address by Prof. -M. M. Rindl, Ing.D . President of the Section. 



2. The geology of the neiglihonrhood <if Stellcnhnscli : I'rof. S. J. 



SnANt),"Ph.l).. n.Sc./p.G.S. 



llliDMiSDAY. JULY 4. 



3. Description (jf a ISaclcrimn wliich oxidises arsi.'nite ■ to arsenate, and 



of one which reduces arsenate to arsenite. isi dated from a cattle- 

 dipping tank: II. H. Gkeen, D.Sc. 1'\C.S. 



4. .An old report on the copper field of X'amaqualand : .\. W. Ro<;ek-s, 



iM.A.. Sc.L)., F.G.S. 



5. Note on the micro-titration of arsenic: H. H. Gkeex, D.Sc, F.C.S. 



THURSDAY, JULY 5. 



6. Note upon the analysis of soda-sulphur dips: 1>. J. }1ill. 



7. Sea-bamboo (Ecklonia hucciiialis) as a source of jiotash : G. F. 



Britten, B.;\. 



8. Simple expedients in experinuntal chemistry : Prof. B. de St. J. VAN 



DER RiET. M.A., Ph.D. 

 y. Experimental exi)ression of the relationship between the content of a 

 foodstuff in anti-neurn:c hormone and the period of healthy 

 survival of animals u]wn it: H. H. Green, D.Sc, F.C.S. 

 10. The vitamine cc>ntent of maize and maize milling products, and the 

 ambiguity of its relation with the pliosithnric oxide content: }I. H. 

 Green, D.Sc, F.C.S. 



