40 



HEAT OF THE EABTH. 



Depth, below 



Degrees of Temperature. 



the surface 

 in feet. 



At each depth. 



Differences. 



Cent. 



Fahr. 



Cent. 



Fahr. 



els 



li 



( ° 



30 



60 



100 



200 



300 



400 



500 



600 

 ^680 



Q-7K /(Mean of 

 y /0 I the year.) 



10-5 



10-625 



11 



49-55 

 50-90 

 51-125 

 51-80 



0-875 

 1-250 

 1-087 

 1-038 

 1-062 



1-575 

 2-404 

 1-802 

 1-869 

 1-911 



11-875 



53-375 



13-125 



55-779 



14-212 



57*581 



15-25 



59-45 



16-312 

 17-250 



61-361 

 63-05 



o 



s 



p 



f ° 

 80 



200 

 300 

 400 

 500 

 600 

 700 



800 



880 



o.k /(Mean of 

 ° I the year.) 



10 

 13-44 



47-30 



50 



56*19 



1-49 

 1-43 

 1-39 

 1-37 

 1-61 

 1-61 



2-68 

 2-57 

 2-51 

 2-46 

 2-90 

 2-90 



14-93 



58-87 



16-36 



61-44 



1775 



63-95 



19-12 



66-41 



20-73 



69-31 



22-34 

 23-50 



72-21 

 74-30 



The experiments made at various places do 

 not agree accurately in their results, as to 



