Nature, Volume 73

acid action agricultural animals appears Association astronomical Batoka Gorge British Cape Cape Colony Cape Town carbon cent chemical chemistry College colonies colour comet committee connection contains deals December described Diplodocus discussion disease effect electric engineering experiments fact feet geological given gives illustrated important Indian Institute interesting investigation islands J. J. Thomson January laboratory larvæ lectures light lines London magnetic mathematical matter ment Messrs meteorological method miles Morosaurus Museum nature nitrogen November November 15 November 30 observations Observatory obtained original paper photographs physical plants position practical present president prize produced Prof published radio-activity radium rainfall recent recorded referred regard rocks Royal scientific Society solar South Africa species surface temperature theory tion Transvaal University various Victoria Falls volume W. H. Perkin Yerkes Observatory