FOKMATION" OF COAL. 



period are, in short, due the physical agencies by which the art 

 of gas illumination, all the industries depending on the production 



r 



Fig. 144. Map of Westeni Europe iu the Carboniferous period, sketched 

 by M. Elie de Beaumont.* 



of artificial heat, and all the -wonders effected by the steam- 

 engine are due. 



286. It is to the close of this fourth Paleozoic or Carboniferous 

 period, and before the commencement of the Permian deposits, 



* This map is reproduced from the Geology of M. Beudant, with the 

 permission of the author and publisher. 



E2 51 



