174 THE PHYSICAL GEOGRAPHY OF THE SEA. 



season in intertropical countries, as on the coast of Africa, there 

 is often not radiation enough to produce the phenomena of land 

 and sea breezes. The absence of dew in cloudy nights is a familiar 

 instance of the anti-radiating influence of clouds. The southern 

 hemisphere, being so much more aqueous,' is no doubt much more 

 enveloped with clouds where its oceans lie, than is the northern 

 where its continents repose, and therefore it is that one hemi- 

 sphere radiates more than the other. 



869. Thus, by observing and discussing, by resorting to the 



Facts and pearls, forcc of rcasou and to the processes of induction, 



we have gathered for the theory that favors the air-crossings at 



the calm belts fact upon fact, which, like pearls for the necklace, 



only require a string to hang them together. 



