STEVENSON— INTERRELATIONS OF THE FOSSIL FUELS. 183 



so great in the coals analyzed by Nendtvich, but there is a differ- 

 ence of 7 per cent, in the volatile of two coals with essentially the 

 same ultimate composition. The water in these Hungarian coals is 

 from 4.83 to 17 per cent, and the ash from 4.23 to 11 per cent. 



The coals of Brandenburg, in the region studied by Plettner, 

 show notable variation, according to analyses reported by Zincken; 



A great part of the Sachsen coal is Formkohle, which according to 

 analyses by Karsten and Bredlick, cited on an earlier page, contains 

 from 62.74 to 64.32 of carbon and the oxygen varies little from 30 

 per cent. The analyses of the Brandenburg coals seem to indicate 

 that the composition and the physical structure of the coal- are not 

 related, Formkohle being highest and lowest in carbon as well as 

 in oxygen. These Oligocene coals differ not much from mature peat 

 in their composition. ^^^ 



Katzer analyzed two samples from an opening in the Lauser 

 bench of the bed near Banjaluka in Bosnia, which show no great 

 variation ; 



The water is from 21.82 to 29.05 and the ash, 7.40 to 8.45; sulphur 

 is high, from 6 to 7 per cent. 



The Oligocene coals of British Columbia are, in many cases, bitu- 

 minous; the region being more or less affected by eruptive rock. It 

 is not certain that the analyses reported give any clear conception 

 respecting the general character of the coal, as the samples analyzed 

 were selected from the outcrops. 



256 C. Zincken, pp. 28, 29. 



