GENERAL INDEX. 43 



CHEMICAL ANALYSES of: 



Coal in Scott Co., various mines 111,141.142 



St. Clair Co., various mines 1,308,309 



Vermilion Co., Danville 17,257 



Grape Creek IV, 259 



Warren Co., Avon 1,276 



Spring Grove 1.276 



Coal from Scotland and from Kentucky (for oil) 1,272 



Fire-clay in Adams Co., Coatsburg ; 1.275 



from England used for glass-melting pots 1,275 



Fuels, different kinds 1,260 



Ores, iron, in Hardin Co.. pipe ore 1,256 



limonite 1. 257 



Schuyler Co., Argillaceous carbonate 1.275: HV.87J 



from Pennsylvania, Argillaceous carbonate 1.275; UV,87] 



Ores, lead, in Hardin Co., Galena with gold and silver in. 18 



from 111. and Wis., Galena with silver 1.188 



Water, brine, in Gallatin Co., Saline VT.216 



chalybeate in Hamilton Co.. McLeansboro VI.80 



Schuyler Co IV, 89 



alkaline in Brown Co., Versailles IV, 74 



Pike Co., Perry Springs IV.41 



Chemical analysis of soil, importance of 1,257 



Chemung group , n, x 



Chester group 1, 41, 77-83; VH. 34 



Cincinnati group 1.136-141.172; ll.xviii; 111,324; Vn,58 



Clay 1,24,48,275; VH.40 



Clear Creek limestone 1,126-129; H.x 



Climate of Illinois 1,2 



Coal, amount produced from a given thickness 1,65 



' analysis of see Chemical analyses. 



' ' anthracite 1,65 



" beds, dip of 111,16 



' ' cannel 1, 64.262 



' ' classification of 1,261 



" how formed 1,68,209 



" production in Illinois in 1867 III. 16; V.7 



1880 V.7 



Coal fields of Illinois, report by LEO LESQUEBEUX 1,208-237 



Coal measures, reports by A. H. WOBTHKN ..1,49-76; 111,1-17; VI.1-8; VH.1-34; Vm.25-54 



general sections of, in Illinois 1,234; VI,3; Vn,2 



Coal oil 1,72,268-272; VTI,37 



Coke and Coking 1.70,268-272 



Concretions IV, 18 



Cone in cone, or Tuten mergel VI. 128,131 



Conglomerate 1,48,82; m,l,9.68 



Copper in the drift, native V.101; VHI.19 



Coralline beds 1, 177 



Cornif erous group 1,120; in, 407 



COUNTIES,* geological reports on Vols. I, III- VII 



* The items of each county report are not arranged alphabetically in this index, but 

 generally in the following order: Physical features, Sections of Strata. Stratigraphical 

 Geology (in chronological order). Economical Geology, Indian antiquities. 



