TUAS»^TOI.ATi PASSAGE. 47 



tar. How, if it be admitted, that tbe infioenee of 

 the son at the time of the summer solstice he near- 

 1 J one-fimrth greater at idie Pole than it is at the 

 equator, it must he aDoired, from the same prine^^ 

 that diis infloence in the parallel of 7^9 where it is 

 only aboat one £»rt}r-fifili part less than whatitisat 

 the Pole^, nmst also be eonsideiahij greater idian at 

 the equator; and, there&re, that whaterer effects are 

 produced bj the son's peeoUar acticoi at the Pole, the 

 same, in a proportionate degree, nmst be felt at the 

 parallel of 78". W^e shall oideaTonr to ase^tain, 

 whether the presence of the sask dnring: sef era! 



months together in the Spitzbergen sea, prodnees any 

 thing like the eSeet presnmed bj the adroeates of 

 an open sea at the Pole. 



From Taiions meteorologieal calculations^ ifmoAed 

 «Q a carefal iiiTeatigation of the laws of tempera. 



* As th- :e is prcpoitioQsl to tfse sines of tfce 

 sun^s altit-.; - ' ^f the smi at die Voiej is to r£s power 



atAe aaar- .- kfibide wbereitdoes uoe set, 



as tiie ame : -. die Poie, is to half the sum 



of the siBe& . : : - . . . : kaat aMlnde diiriiig: dbe dar 

 indaeodie:- ;. nearly. Thraatiie solar imffiBeaice 

 at die Pol- '"-•irizontal stnfaee, repre- 

 sented hj - -0 the ame of 2S-k, the 

 son's altitu if l^rand^rideror 

 radios beL-. ^ of I»*, the 

 sine of 35 1 " ■ • " . awMij^ ^ ^j^ 

 isine « 11^, the sor. ■ . - '., and the mshosmt 

 dirided.fay 2, givea ■ - -it tJie sof^cice 

 in latitude 7S*; -wiu ., -f:.v7. ti= s« 

 influence at the Pole, bet grestei than it £5 



