X CONTENTS. 



Chapter XII. — Influence of the drift on drainage systems and conditions — Cont'd. Page. 



Kaskaskia River drainage basin 523 



Kaskaskia River 523 



Shoal Creek 524 



Silver Creek 525 



Big Muddy River drainage basin 526 



Saline River drainage basin 527 



Cache River 528 



Wabash River drainage basin 528 



Preglacial Wabash Valley 529 



Minor deflections oi' the Wabash 530 



Little Wabash River 530 



Bon Pas River 531 



Patoka River 532 



White River 532 



Embarras River 534 



Bnsseron Creek 535 



Big Raccoon Creek — 535 



Sugar Creek 536 



Vermilion River 536 



Lake Michigan drainage basin 538 



Chicago River , - 538 



Calumet River --- 538 



Trail Creek 539 



Galien River - 539 



St. Joseph River 539 



Pawpaw River 540 



Black River 541 



Kalamazoo River - 541 



Chapter XIII. — Average thickness of the drift in Illinois 542 



Chapter XIV. — Wells of Illinois 550 



Introduction 550 



Classification of underground waters 550 



The geologic formations - - 552 



Attitude of the strata '553 



Essential conditions for artesian wells 555 



Relation of the drift to ordinary wells 557 



Gas wells 557 



Tabulation of sources for city water supply ">57 



Detailed discussion 564 



Jo Daviess County 564 



Stephenson County . . '. 567 



Winnebago County 569 



Boone County 573 



McHenry County 575 



I .ake County - - 579 



Cook County 581 



Dupage County 591 



Kane County , 594 



Dekalb County 599 



Ogle County 604 



Lee County 608 



Carroll County 611 



Whiteside County 614 



Rock Island County 619 



Mercer County 622 



Henry County 623 



