36 THE OCEAN. [Book II, 



from the equator ; the circles of rotation being 

 completed by under currents flowing towards the 

 equator. 



But, under the combined action of the forces 

 which tend to cause these systems of circulation, the 

 water which on the west of the district is turned 

 from the equator by the horizontal force, necessarily 

 comes into conflict with that tending to diverge all 

 along the line of the equator under the action of 

 the vertical force. The streams oe, in figure 1, 

 diverging under the action of the vertical force, must 

 then be borne back by that under the action of 

 the horizontal force a b c, until, by the accumulation 

 of the streams o e, they form a stream equal in force 

 to A B c. 



Let the point x, in figure 2, be the meeting-point 

 of the opposing streams thus formed. 



Then the stream A b c meets the stream o e at x ; 

 and from the meeting-point at x the off'set d falls 

 into the course of the rotation of the district s w n e ; 

 but the ofi'set e, running in the opposite direction, 

 must come into conflict with that course of circu- 

 lation. 



Let Y be the point at which the stream e meets 

 the stream s w n e. 



Then from the meeting at y the offset r falls into 

 the course of rotation s w n e ; but the ofi^set h, 

 running in the opposite direction, must come into 

 conflict with the course of rotation s w n e. 



