president's address. — SECTION G. 



191 



and gold (making the production in 1880 = 1,000) has been as 

 follows since 1880 (see graph No. 3) : — 



Of course, with an increase of population one must expect an in- 

 crease. If, however, we divide each of the above results by the 

 population figures 1,000, 1,110, &c., we get what may be called 

 the "index of production per head;" instead of writing it 1, we 

 shall make it 1,000, and thus obtain the following results: — 



Index of Relative Production Per Head of Population. 



These results show that the rate of increase in the production is 

 most marked in the case of copper, next in iron and steel, then 

 zinc, gold, and tin in that order. The increase in the use of 

 aluminium is, however, much more notable, as the following pro- 

 duction figures show : — | 



Index of Production 

 Index of Population 

 Relative Production per head of 

 Population 



1897. 



1,000 

 1,000 

 1,000 



1900. 



2,297 

 1,091 

 2,105 



1910. 



6,260 

 1,226 

 5,106 



1915. 



27,040 



1,277 



21,175 



1918. 



69,484 



1,302 



53,367 



* The 1,000 unit shown as 1,000 is 2.3,169,000 metric tons in the case of iron and steel ■ 156 500 

 in the case of copper ; 33,300 in the case of tin ; 231,400 in the case of zinc ; and 5,160,000 fine 

 ounces in the case of gold. 



+ In the case of population the 1,000 unit is 280,160,000 and is for the countries of Europe 

 America, and Australia shown earlier hereon. ' 



t The 1,000 unit here is 3,195 metric tons. Population as before, viz., 317,64i,000 for year 



