NATIONAL POWER AND COAL 169 
artificial production of particular kinds of coal from 
particular types of plants to supply special substances 
. We may from time to time require as our civilisation 
advances. 
In 1833 our countrymen led the way in microscopic 
examination of coal. For long we led in the production 
of coal; we have lost that lead. Ever since coal was a 
marketable commodity we have led the world’s export 
trade in it—now, owing to the disposal of the stores of 
coal by Nature, we see that we cannot for ever maintain 
that lead. Hence, now, let our inspiration be to lead 
in real understanding of coal and the plants which 
formed it, and by our understanding master the coal 
problem. 
But that means Scientific Research, and yet again 
Research. 
A Few REFERENCES TO THE LITERATURE ON COAL 
The general reader will probably find most interest in ‘ The British 
Coal Trade,” by H.S. Jevons, 1915. Pp. xii, 876, 23 text figs. and 
maps. London. 
From the vast scientific literature on coal the following are selected 
as of outstanding interest and importance. 
The chapters on coal in “ Acadian Geology,” by J. W. Dawson, Ed. 2, 
1868. Pp. xxvi, 694, 231 text figs. London. 
“ The Geology of Coal and Coal Mining,” by W. GriBson, 1914. Pp. 
viii, 341, 37 figs. London. : 
“The Coal Resources of the World: An Inquiry made upon the 
Initiative of the Executive Committee of the rath. International 
Geological Congress, Canada, 1913,” 3 vols. and atlas. Toronto, 
“Formation of Coal Beds,” by J. J. STEvENson. Proc. Amer. Phil. Soc., 
vol. 1. (1911) pp. 1-116; 519-643: vol. li. (1912) pp. 423-553: 
vol. lii. (1913) pp. 31-162. Lancaster, U.S.A. (Republished in 
Iso. -_ ; : 
ee Pie Decne: Ceckegy of the Netherlands and Adjacent Regions, with 
