1818.] Distribution of Heat over the Globe. 185 



The following table shows how the annual heat is divided 

 between the two seasons of winter and summer in all the dif- 

 ferent parts of the temperate zone. The observations are traced 

 nlong the isothermal lines from W. to E., and those are preferred 

 which are situated nearest to the most curved parts of the lines ; 

 the longitudes are taken from the meridian of Paris : 



Mean temperature of 

 Isothermal lines from 32° to 68=. Winter. Summ. 



fLone S4°30'W. ; lat. 29° 30. (Florida) 53-6 .. 80-6 



• Isothermal J Lon » iqpi9'W. ; lat. 32° 37 (Madeira) 63-6 .. 72-0 



lines of 68°. \ Lo „J o° 40' E. ; lat. 36° 48' (N. of Africa) 59-0 .. 80-6 



Isoth. line of J Long, 92° W; lat. 32° 30' (Mississipi) 464 „ 77'0 



63-5° i Long. 11° 51' E. ; lat. 40° 50' (Italy) 50-0 .. 77'0 



Isoth. line of /Long. 86° 30' W. ; lat. 35° 30' (Basin of the Ohio). 39-2 . . 78-4 



590 "I Long. 1° 2' E,; lat. 43° 30' (South of France) 44-6 .. 75-2 



f Long. 87° W. ; lat. 38° 30' (Amer. W. of the Alleg- 



hanys) 34'7 •• ™-2 



... „ Lon<r.'76°30' W. : lat. 40° (Amer. E. of the Alleg- 



Jsoth.line of J hanys) 32-7 .. 77-0 



54 ' 3 °- I Long 3° 52'' W.' ;"lat'.'47° 10' (West of France) 410 . . 680 



I Long. 7°E.; lat. 45° 30' (Lombardy) 34-7 .. 73-4 



i Long. 1 14° E. ; lat. 40° (Eastern Asia) 266 . . 82-4 



Long. 86° 40 7 W. ; lat. 41° 20' (Amer. W. of the 



Alleghanys 311 •• 71 ' 6 



Lone. 73° 30' W. ; lat. 40° (Amer. E. of the Alleg- 



hfnys). 3°-2 •• 73-4 



Isoth. line of 



Long. 9° W. ; lat. 52° 30' (Ireland) 39'2 



59-8 



50 °- I Long. 3° W.; lat. 53° 30' (England) 37-4 .. 62-6 



Long. 0°; lat. 51° (Belgium) 365 .. 61-5 



I Long. 16° 40' E.; lat. 47° 30' (Hungary) 31-1 .. 698 



I Long. 114° E. ; lat. 40° (Eastern Asia) 23'0 .. 78-8 



f Long. 23° 20' W. ; lat. 44° 42' (Amer. E. of the Alleg- 



I hanys) • ^ 3 9 •• '•''® 



Isoth. line of J L 4030'W. ; lat. 57° (Scotland) 36-0 .. 564 



45-5°. ^. L * , o 15' e.; lat. 55" 40' (Denmark) 31-3 .. 62-6 



I Long. 19° E.; lat. 53° 5' (Poland) 28-0 .. 66-2 



f Long. 73° 30' W. ; lat. 47° (Canada) 14*0 .. 68-0 



Lon«-. 7° E.; lat. 62° 45' (Western Norway) 24-8 . . 62-6 



Isoth. line of J Lon » I5 o E . lm. 60° 30' (Sweden) 24-8 .. 60-8 



41 °- 1 Long 22° E.; lat. 60° (Finland) 230 .. 63-5 



I Long. 34° E. , lat. 58° 30' (Centre of Russia) 13-0 .. 68 



fLon». 74° W. ; lat. 50° (Canada) 68 .. 60-8 



Isoth. line of J Long. 15° 45' E. $ lat. 62° SO 1 (W. coast of gulf of 



36-5°. S Bothnia) JI' 5 • • ?J*2 



(. Long. 20° E. ; lat. 62° 50' (E. coast of ditto) 16- 1 . . 59-0 



. ,. , f Long. 60° W. ; lat. 53° ( Labrador) 32. .51-8 



Isoth. line of J L ' no 30 , E . lat# 65 o ( Sw eden) 11-3 .. 53-6 



32 °- t Long. 23° E. ; lat. 71° (Northern part of Norway). — ..45-7 



We may perceive from this table that the inequality of the 

 winters on the same isothermal line increases as the annual 

 heat diminishes, from Algiers to Holland, and from Florida to 

 Pennsylvania. If, instead of observing the most severe winter 

 which is found in every climate, we trace the lines of similar 

 winter temperatures, which we may style isocheimal lines ; these, 

 so fur from coinciding with the isothermal lines, oscillate round 

 them, and connect situations that are placed upon different 



• These numbers, expressing the isothermal lines on the centigrade sca\e, are, 

 £0°, 17f , 15°, I2£°, 10°, 74°, 5°, 2*°, 0". 



