4 BULLETIN 142, IT. S. DEPARTMENT OF AGRICULTURE. 
through Bucyrus and Columbus to the vicinity of Chillicothe. The 
line is irregular, and coincides roughly with the eastern boundary of 
the Scioto Basin. From the vicinity of Chillicothe the southern 
boundary extends generally westward through Hillsboro and Hamil- 
ton, Ohio, to the Indiana State line. In southeastern Indiana the 
southern boundary is irregular and crenulated, swinging north nearly 
to Connorsville, and thence southwestward through Greenburg to a 
point seme 20 miles southeast of Columbus. Thence it extends 
northwestward through Columbus and Martinsville nearly to Green- 
castle. From this point the western boundary of the region- ex- 
tends in a generally northward direction, following approximately 
the course of the Wabash River, between Logansport and Coving- 
ton. Between the Wabash and Tippecanoe Rivers a large area of 
the soils of this series extends westward to the eastern part of 
Pulaski County. The western boundary thence swings eastward to 
the vicinity of Warsaw, and northward in a very irregular line to 
Elkhart. From this point it crosses into Cass County, Mich. In 
southwestern Michigan the soils of the Miami series are so intimately 
associated with those of the Coloma series and with the soils of the 
extensive outwash plains that it is almost impossible to establish 
boundaries between sections dominated by the soils of the Miami 
series and those in which soils of other series predominate. How- 
ever, along the border of Lake Michigan and extending around its 
southern end there is a belt of rolling and elevated territory within 
which the Miami soils are decidedly important. This belt stretches 
from the vicinity of Kalamazoo through the extreme southwestern 
part of Michigan, around the end of Lake Michigan, but at some 
distance from the shore. 
From Tiffin, Ohio, through Fostoria and Findlay to the north of 
Lima, Ohio, and thence to the vicinity of Fort Wayne, Ind., the 
soils of the Miami series are bordered to the north throughout the 
Maumee Basin by an extensive, nearly level area, in which the soils 
of the Clyde series are the most extensive. There are a few small 
areas of Miami soils within this basin of the Maumee River. 
From Fort Wayne, Ind., the eastern boundary of the area within 
which the soils of the Miami series predominate extends in an almost 
due northeasterly direction to a point in the " thumb " of Michigan 
immediately north of Bad Axe. To the east and south of this line 
the soils of the Clyde series are extensively developed between the 
area of Miami soils and the shores of the Lakes. In the Saginaw 
Bay region the boundary of the Miami series extends southwestward 
from near Bad Axe to the vicinity of Flint and thence westward to 
a point a little to the northwest of St. Johns, Mich. Thence it fol 
