SOIL HEAT 



303 



Temperatures of Different-colored Soils at a Depth of 



4 INCHES, TAKEN JUNE 23, 1876, AT MXJNIOH (iN DEGREES 



Centigrade) 



Time 



Midnight 



2 A.M. 



4 . . 



6 . . 



8 . . 



10 . . 

 Noon 



2 P.M. . 



6 . . 



8 . . 



10 . . 



Air 



9.6 

 10.0 



7.6 

 16.0 

 19.8 

 23.0 

 25.4 

 25.4 

 24.8 

 22.6 

 19.4 

 16.1 



Bl-ick 



13.8 

 12.4 

 10.7 

 9.6 

 10.4 

 15.7 

 22.1 

 26.8 

 29.4 

 28.8 

 27.2 

 24 



White 



lo.o 

 12.4 

 10.8 

 9.6 

 10.9 

 13.8 

 17.6 



23!6 

 24.0 

 23.6 

 21.6 



/or/MB 



Fig. 47.^ — Curves showing the temperature variation of different-colored 

 soils at a four inch depth compared with air temperature. Munich, 

 June 23. 1876. 



