186 STEVENSON— INTERRELATIONS OF THE FOSSIL FUELS. 



same beds the oxygen is 20.77 ^^^ 16.94 in the two analyses of the 

 bottom bed while it is but 17.85 in the fifth. The ash is from 6.02 

 to 13.31 per cent, of the freshly mined coal, which contains 8.60 to 

 11.69 of water. Much of the coal, according to these analyses, 

 would be regarded as inferior. In this field, as in the Sheridan, 

 there is no relation between ash and volatile and comparison of 

 analyses shows that position in the section is not very important. 

 Proximate analyses from the Miles City field in Montana tell the 

 same story, for the volatile varies from 42.49 to 49.60 in sound coal 

 from the lowest bed, while a single analysis of crop coal from a bed, 

 800 feet higher, shows 48.09. Water in the lowest bed is from 29.25 

 to 43.70, while that of the highest is 35.51."'''^ 



Analyses were made of 7 samples cut in the Snyder mine near 

 Glendive on the eastern border of Montana. 



Ultimate analysis was made of only four samples. In all cases, sam- 

 pled by the official method, the coal is sealed in waterproof cans 

 at once, so that it reaches the laboratory in fresh condition. 



The ash varies in this small mine from 8.62 to 12.44 P^r cent, 

 of the dried material ; no relation exists between it and the volatile ; 

 3816 and 3819 have practically the same ash, 12.39 and 12.44, but 

 there is almost 25 per cent, difference in the volatile. 3815 and 

 3816 have almost the same ultimate composition, but their volatile 

 differs by almost 16 per cent. 



The Leonard and Smith samples are from eastern North Dakota, 

 and their bed C is taken to be about 300 feet above the Glendive bed ; 

 bed G is somewhat more than 250 feet above C. 



-•50 The same, Bull. 22, pp. 124-126. 



