Atmosphere and the Earth. 



247 



Height Temp, of 

 above Sea Earth, 

 in metres. Fahr. 



Temp, of 

 Air, 

 Fahr. 



Observer. 



Congo, 



Cumana, 



St Jago (Cape Verd Isles), 

 Rockfort (Jamaica), . . 



Havannah, 



Nepaul, 



Teneriffe*, 



Cairo, 



Cincinnati, 



Philadelphia, .... 

 Carmeaux-f-, .... 



Geneva, 



Paris, 



Berlin, 



Dublii), 



Kendal, 



Keswick, 



Konigsberg, 



Edinburgh, 



Carlscrona, 



Upsal, 



Umeo, 



Giwartenfiiill, .... 



9 



m 



15 

 18 

 23 



28 



28i 



30 



39 



40 



43 



40 



49 



52| 



53 



54 



54i 



S4i 



56 



56| 



CO 



04 



06 



45 



















0? 









 160 







300? 



350 



75 



40 

































 500 



72.95 



78.12 



76.10 



79.02 



74.30 



73.85 



04.40 



72.5 



54.27 



54.95 



55.40 



52.02 



52.70 



50.22 



49.32 



47-76 



48.05 



40.62 



47.75 



47.30 



43.70 



37.17 



34.25 



78.12 



82.40 



77.00 



80.60 



78.12 



77.00 



70.92 



72.5 



53.82 



54.27 



67.07 



49.32 



61.57 



40.40 



49.10 



40.17 



47.97 



43.25 



47.75 



47.30 



42.12 



33.35 



25.25 



Smith. 



Humboldt. 



Hamilton. 



Hunter. 



Ferrier. 



Hamilton. 



Buch. 



Nouet. 



Mansfield. 



Warden. 



Cordier. 



Saussure. 



Bouvard. 



Kirwan. 

 Dalton. 



Erman. 



Playfair. 



Wahlenberg. 



We may augment this Table by the observations made in 

 Kasan and the Urals. For, where the temperature of the air is 

 unknown to us, we will fix it by analogy, from which no great 

 error can arise, as the places are so near each other. It is 

 known, that, for middle latitudes, the diminution of tempera- 

 ture is 1°.125 for every degree. This is established by obser- 

 vations made near the points in question, naniely, in Petersburg 

 and Moscow. The difference of latitude between these two ci- 

 ties is 4°^ ; the mean temperature of the air at Petersburg, is 

 38°. 75 ; of Moscow, 40°.l ; the difference of the mean tempera- 

 ture is therefore 1°.35. As Moscow is nearly 300 metres higher 

 than Petersburg, to this difference 2°,92 is to be added ; we have 

 therefore a decrease of nearly 4^.5 for 4°.^ of latitude, or not 

 quite 1M2 for each degree of latitude. 



• As at a height of 1500 feet the temperature of springs in Tenerifle 

 is almost the same, so might the temperature C4°.40 belong to a somewhat 

 liigher place (as often seems to be the case in mountainous districts), and 

 therefore, if we reduce it to the level of the sea, an augmentation would be 

 required. 



f The mean temperature is estimated from Uic mean temperatures of 

 Monlauban, Toulouse, and MontpcUicr. 



