. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Salinas Cruz, it was not unusual for a ship to experience a favoring current on the southern voyage, and, after a fortnight's discharge of freight in the Mexican port of Salinas Cruz, encounter a likewise favoring current on the northern voyage as well. Such a reversal of the drift of the water was occasioned solely by the fair weather north winds and the rainy south winds. Severe storm winds and tidal waves cliange beach lines—High winds blowing shorewards throw up quantities of sand as do al
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Salinas Cruz, it was not unusual for a ship to experience a favoring current on the southern voyage, and, after a fortnight's discharge of freight in the Mexican port of Salinas Cruz, encounter a likewise favoring current on the northern voyage as well. Such a reversal of the drift of the water was occasioned solely by the fair weather north winds and the rainy south winds. Severe storm winds and tidal waves cliange beach lines—High winds blowing shorewards throw up quantities of sand as do also tidal waves. In this way stretches of sand will wash away and the waves will deposit the sand at other places along the shore. The disinte- grating effect of such wave action is shown all along the southern California coast. Plate 13, accompanying this article is an example of the disintegrating effect of wave action; it also shows in a very interesting manner the circular wave motion produced by a rocky island. Shortly after the great Japanese earthquake disaster of the autumn of 1923, changes in the shore line of the western coast of America were noticed. The shape and size of the beaches were thus changed overnight, accomplishing what would otherwise require years of ordinary tidal action. Such instances are rare and their effect is sporadic. The impulses of such wave motion is entirely incidental and have no relation whatsoever to ocean PLATE 13. LONG POINT FROM POINT VINCENTE. PALOS A^ERDES COAST (Photographed by Ford A. Carpenter, February, 1916) The crest of the point as shown in the photograph, has an elevation exceeding 100 feet above mean tide, and the rocky pinnacle which is shown surrounded by water even at low tide, rises 30 feet aliove the water-level and 70 feet above the bottom of the sea. Particular attention is directed to two things in this photograph; 1st, the spectacle of rapid disintegration by ocean current, and 2nd, the effect of a rock p
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