PERMIAN GLACIATION 



585 



anomaly -|-1.92° F. greater in the later month than in the earlier. The 

 difference between these two figures is 0.59° F. If there were no increase 

 in cloudiness in the first group of places .the temperature would appar- 

 ently rise to this extent — that is, 0.59° — higher than it actually does. In 

 the oceanic areas the result is similar. Here the places which show an 

 increase of cloudiness show a lowering of their anomaly to the extent of 

 — 1.49°, while those which have a decrease of cloudiness show a lowering 



Table 9 



Comparison of Changes of Cloudiness from January to July ivith Changes of 

 Temperature AuomaJy from January to July, heticeen 30° south and 30° north 





III 



o 



6C§ = 



OJ 5- ^ 



« O S 



t- a c 



?^ c« cS 



Whole world : 



Regions with same cloudiness in January 



and July 



Regions with less cloudiness in January 



than in July 



Regions with more cloudiness in January 



than in July 



Land : 



Regions with less cloudiness in January 



than in July 



Regions with more cloudiness in January 



than in July 



Ocean : 



Regions with less cloudiness in January 



than in July 



Regions with more cloudiness in January 



than in .July 



12.0 

 40.0 



48.0 



10.2 

 19.4 



30.0 

 28.4 



0.00 

 +1.37 

 —1.61 



—1.35 

 +1.96 



—1.38 



+ 1.28 



+2.59° 

 —0.06° 

 —0.35° 



+1.92° 

 + 1.33° 



—0.74° 

 —1.49° 



Average difference due to clouds, 0.70°. 



of their anomaly only to the extent of — 0.74° F. The difference is 

 0.75° F. The meaning of these facts is that where cloudiness increases 

 the temperature is lower than it would otherwise be to the extent of 

 0.75° F. over the oceans and 0.59° F. over the lands. Making due allow- 

 ance for the difference in the area of the land and the sea, this gives us 

 an average decrease of temperature arnounting to 0.70° F. The amount 

 by which the cloudiness changes on both land and sea is on an average 

 about 1.5, but since the change is plus in one case and minus in the other 



