The Earth a Planet 



solar wealth the Torrid Zone (Fig. 19). If the Earth were 

 a smooth lithosphere, either free from water or surrounded 

 by a continuous hydrosphere and atmosphere, this unequal 

 distribution of solar energy would 

 give rise to a regular system 

 of redistribution by currents 

 streaming from the equator to 

 the poles in the upper regions 

 of the atmosphere, and from the 

 poles to the equator in the lower, 

 their paths curved in consequence 

 of the rotation of the Earth ; and 

 in this way the tropical warmth 

 would be distributed with some 

 approach to uniformity over the 

 whole surface. The actual re- 

 distribution is much more complicated (178 and following). 



FIG. 19. Zones of Climate on the 

 Earth. 



REFERENCE 



1 Sir Wm. Thomson on "The Sun's Heat," Nature^ vol. xxxv. p. 

 297 (1887). 



BOOKS OF REFERENCE 



(The 



J. F. W. Herschel, Astronomy, Cabinet Cyclopaedia, 

 most perfect description of simple mathematical astronomy. ) 



R. S. Ball, Time and Tide: A Romance of the Moon. S.P.C.K. 



James Nasmyth, The Moon considered as a Planet, a World, and a 

 Satellite. John Murray. (Unique illujJfS&era <3f.fi5*S$tirface of the 

 Moon.) Xfe1e> 



See also list at end of Chapter 



