146 THE OCEAN. [Boox V. 



The tendency of this Antarctic stream to take its 

 northward course through mid-ocean, compared with 

 that of the Arctic stream hugging the shore in its 

 southward course, accords with what would naturally 

 be the action of vis-inertise resulting from a south- 

 ward motion of the earth. For we have seen that 

 the action of such a force tends to circulate the 

 waters northwards through the deep and central 

 parts of the ocean, and southwards along the shores. 

 This action appears to be again exemplified on the 

 east of the ocean by the frequent occurrence of a 

 stream southwards from the equator along the west 

 coast of Africa ; the northward stream from the direc- 

 tion of the Cape of Good Hope being drawn towards 

 mid -ocean, whilst the southward stream runs between 

 it and the coast. 



PAET IL 



EVIDENCES OF VARIATIONS ACCOEDING WITH THE VARIA- 

 TIONS IN TEE COURSE OP THE EAETH's ORBITAL 

 MOTION. 



As regards that annual variation in the ten- 

 dency of northward streams towards mid-ocean, and 

 of southward streams towards the coasts, which appears 

 to indicate the influence of the earth's orbital motion, 

 tending to make the northward action of vis-inertite 

 more decided in March than in September : it appears 



