Methods of Gold Extraction. ^49 



and iniiumeral)]e other products made. Possibly with such an institu- 

 tion might be incorjiorated a physical testing labaratory. 



But the dominating feature of the future will be the extent to 

 which this already vast industry will grow. Up to the present time 

 about eighty-five million pounds worth of gold has been produced. 

 The greatest rate of production hitherto was during 1899 when gold 

 was won at the rate of nineteen million pounds worth yier annum. 

 By late conservative estimates it is anticipated that in a few years 

 twelve thousand stamps should be at work, crushing about twenty 

 million tons of ore per annum with a gold yield valued at forty 

 million pounds, and that this production should increase rather than 

 decrease as time goes on. Already nearly two-thirds of the world's 

 gol<l is produced within the limits of the British Empire, and for 

 many years to come the narrow seventy mile strip of land forming the 

 Witwatersrand proper should alone yielfl gold which will go far to 

 maintain this proportion. 



16.— THE SOLOR CORONA. 

 By Profhssor J. T. Morrisox, M.A., B.Sc. F.R.S.E. 



N'OT PRIMED. 



