Vlll CONTENTS. 



PASE 



Part III. — -Effects in an Ocean surrounded by Land. 



Section 1. — Equatorial and Polar Districts . . 28 

 Section 2. — Equatorial Counter-currents '^ . . . 31 

 Section 3. — Inclination of the Axes of Rotation . . 33 

 Section 4. — Surface Currents within the Districts . . 3.5 

 Section 5. — Vertical Circulation within the Districts . 37 

 Section 6. — Under-currents within the Districts . . 38 

 Section 7. — Difference in the Action of Counter- 

 currents in Equatorial and Polar Dis- 

 tricts 39 



Section 8, — Connecting Currents between Equatorial 



and Polar Districts . . . .39 



Section 9. — Subdivision of Districts . . . . 40 



Part IV. — Effects in the Ocean as it is . . . .41 



CHAPTER III. 



Effects of the Earth's Onward Motion. 



Part I.— Effects of Orbital Motion 47 



Part II. — Effects of the Motion of the Solar System. . 52 



BOOK III. 



ON THE ABSTRACT NATURE OF THE FORCE 

 WHOSE CURRENT-CREATING ACTION IS DE- 

 SCRIBED IN BOOK II. 



YIS-INERTIiE AND GRAVITATION. 



CHAPTER IV. 



That Vis-Inertia and Gravitation are Convertible Terms 

 as far as the Movements op the Ocean are concerned. 



The entire Circulation described in Book II. is caused by 

 Vis-Inertiae : the Force which draws the Water Eastwards 

 in the Temperate Zone;; being the Earth's Oi'avitation, and 



