STEVENSON— INTERRELATIONS OF THE FOSSIL FUELS. 189 



On the borders of Kachemak Bay, farther east, ten samples were 

 collected which have the composition shown in the preceding table, 

 calculated after the same method : 



Number VII. gives the composition of pebbles of lignite forming 

 part of a conglomerate at the bottom of the Kenai (Eocene) in this 

 district. 



Nine samples were cut from the bed on Chicago Creek in the 

 Seward Peninsula, which is 88 feet thick. In each case the sample 

 represents a 12-feet cut. The results of analysis are: 



In the Kachemak area the moisture in freshly mined coal varies 

 from 17.44 to 28 per cent, and the ash is from 10.50 to 20.34 per 

 cent, of the coal, dried at 105° C. But in one sample it is only 7.81. 

 In the Chicago Creek bed the moisture is from 32 to 42 per cent, of 

 the fresh coal and the ash is from 5.77 to 6.49 in dried coal from the 

 upper half of the bed, as represented in analyses I. to IV., but in the 

 remaining analyses it increases, becoming 9, 11, 31, 21 and 26 per 

 cent., fractions being omitted. 



The Kachemak analyses show that the carbon content varies 

 from 64.60 to 69.59, but the volatile is from 50.86 to 64.44. Coals 

 with almost exactly the same ultimate composition differ about 5 per 

 cent, in the volatile. The Seward analyses prove great uniformity in 

 composition of pure coal throughout the immense bed, the variation 

 in carbon being only from 68 to 71, except in one cut, midway, where 

 the maximum of 74 per cent, is reached. The volatile is greatest 

 in the lowest third, where the ash is greatest ; but there is no rela- 

 tion between the ash and the volatile; for in IX. the ash is 26.15 per 

 cent, of the dry coal and the volatile is 46.51, while in VII. the ash 



