100 



Proceeding,"? of Indiava Academy of Science 



winds from the Gulf is dropped sooner than in summer because the 

 continent is cold in winter compared to the ocean while it is com- 

 paratively warm in summer. 



Siioirfnll. The part of the state near Lake Michigan receives three 

 times as much snowfall as does the extreme southern part. (30 inches 

 versus 10 inches.) Furthermore, it does not melt nearly so soon in the 

 northern area, in fact it often remains on the ground for weeks, 

 although it seldom lasts more than a few days in the extreme south end 

 of the state. 



Soil Co)itrasts. The soil shows many local differences, but the U.S. 

 Bureau of Soils recognizes only five main soil regions in Indiana. The 



Fig. 1. Physiographic Regions of Indiana. l^^Morainal, 2^Kanl<al<ce, 3=North 

 Central or Tipton Till Plain, 4=Wabash Lowland. 5=Cravvford Upland. 6=Mitchell 

 Plain, 7=Norman Upland, 8 = ScottsburK Lowland, 9 = Mii.sca1atuek Slojic, 10=Dearborn 

 Upland. (After C. A. Malott) . 



great central section and much of the northern fourth are covered with 

 a glacial clay loam. Considerable areas in the northwestern quarter 

 are very sandy, while others have the famous brown soils of the north- 

 eastern Illinois corn-growing region. In southern Indiana, old glacial 

 soils are found on the east and on the west, while soils derived from 

 sandstones and those derived from limestones cover most of the middle 

 portion of the southern third of the state. 



Tojtogrupliic ContraHtn. In respect to relief or ruggedness, four 

 main types may be recognized: (1) Prevailingly smooth to gently un- 

 dulating, which is the characteristic condition in many counties in cen- 

 tral Indiana. (2) Prevailingly gently rolling to rolling, which is true of 



