184 STEVENSON— INTERRELATIONS OF THE FOSSIL FUELS. 



Eocene Coals. — The analyses of Southland coals in New Zealand, 

 reported by Hutton, are all proximate ; they show the volatile vary- 

 ing from 39 to 63.74 in the pure coal, while the water is from about 

 15 to 17 and the ash from 2.80 to 12.45 per cent. The samples 

 appear to have been selected and not to be representative of the 

 whole bed. No relation appears here between the proportion of ash 

 and that of volatile. Zincken has given an analysis of the English 

 Bovey Tracey coal, apparently by himself, and Dana"^' has published 

 an analysis by Vaux. Ash and sulphur free, these are 



The Eocene coals of Texas are mined extensively at many locali- 

 ties and Phillips and Worrell"^^ have made numerous analyses, the 

 samples having been collected in all cases in accordance with the 

 official method. The composition of these coals varies greatly, even 

 in a single bed within a limited area. The conditions are clear from 

 comparisons of the samples taken from several mines near Rockdale 

 in Milam county. All are reduced to pure coal basis except for 

 water and ash, which are for the coal as received : 



The samples are all from the same bed and are in close proximity ; 

 it is clear that no relation exists between ash and volatile matter. 

 It is equally clear that the conditions were not the same throughout 

 the basin during accumulation of the peat. This appears from the 



257 C. Zincken, p. 28; J. D. Dana, "Manual of Geology," 1895, p. 662. 



258 ^_ B Phillips and S. H. Worrell, " The Fuels Used in Texas," pp. 

 85-89. 91, 92, 98, 100. 



