AND CAHOKE SHINGLE BEACH, CO. WEXFORD. 41 



but that at Chesil the driftage is due to the flow-tide current aug- 

 mented by waves caused by the prevailing winds, while at Cahore 

 the driftage is solely due to the flow-tide currents, its effect being 

 modified by adverse wind-waves ; and that the sorting of the peb- 

 bles on Chesil beach is probably principally caused by the progressive 

 increase in the velocity of the tidal current as it approaches the 

 nodal or hinge-line of the tide in the English Channel. 



EXPLANATION OF PLATE II. 



Redaction of portion of chart, Ireland, sheet XV., Wexford Bay and adjoin- 

 ing coast-line, the Cahore shingle beach, and site of the Cahore lagoon. 



