STEVENSON— INTERRELATIONS OF FOSSIL FUELS. 



39 



differ little but the oxygen-content at Szabolcs is very much greater 

 than at Colonic. The proportion of oxygen has apparently no rela- 

 tion to the depth below the surface. 



The analyses by Nendtwich*" show as a rule less ash in the 

 Steierdorf coals than in those of Fitnfkirchen but the oxygen is 

 somewhat less. 



The Lower Jurassic coals of Siberia, according to analyses given 

 by the Comite geologique, show extreme contrasts. I. and II. are 

 from the Tchoulym field and III. is from the Grande-Bira area. 



The brown coal obtained in other districts is much inferior, as ash 

 is very high. 



The Jura-Trias coals of Queensland are bituminous throughout. 

 Jack reports only proximate analyses but these suffice to show the 

 great difference in conditions : 



Ipswich Group. 



I 



II 

 III 



IV 



BuRRUM Group. 



The Ipswich coals throughout are very high in ash, the specimen 

 VI. being picked from a thin band ; all the coals except VI. and 



^^ C. M. Nendt'wich, " Ungarns Steinkohlen, etc.," Haidinger's Berichten, 

 Band IV., 1848, pp. 18, 21, 30. 



