OF THE GLOBE. 215 



Graham Moore's Bay in the Polar Sea ; and the Asiatic one 

 to the north of the Bay of Taimura, near the North-East Cape. 



This view of the distribution of temperature within the Fri- 

 gid Zone, suggests, or rather renders necessary, a New Law of 

 the Progression of Climates. The gradation of heat on the 

 Transatlantic Meridian is so essentially different from that in 

 the west of Europe, that it is impossible to represent the two 

 classes of phenomena by one Formula, in which the limiting 

 temperatures are found at the Equator and the Pole. No at- 

 tempt, indeed, has been made to include them in the same 

 law, and still less to refer them to a principle which embraces 

 all intermediate meridians. 



As we are not acquainted with the cause of the anomalous 

 distribution of heat in high latitudes, observation alone must 

 guide us in determining the form of the Isothermal lines. 

 From their general resemblance to the Isochromatic Curves, I 

 tried to calculate the temperatures by the product of the sines 

 of the distance of the place firom the two Isothermal Poles ; 

 but this law did not represent the facts, and I found that they 

 might be more accurately expressed by the Formula 



Mean Temp. = 82°.8 Sin. D 



upon the supposition that the greatest cold is Qf of Fahren- 

 heit, or 



Mean Temp. = 86°.3 Sin. D — S»i 

 upon the more probable supposition, that the greatest cold 

 is — Sf of Fahrenheit, 82°.8 being the Mean Temperature of 

 the Equator in the Warmest Meridian, and D the distance of 

 the place from the nearest Isothermal Pole *. 



By 



* The distance D from the Isothermal Pole is in the coldest meiidian 

 = 80° — Lat. ; and in the warmest meridian Cos. D = Cos. 10° x Sin. Lat. 



In 



