. The edible clams, mussels and scallops of California . Fig. 19. Digging Pismo clams, Oceano. Digger returning with his fork and a "limit" of clams in his "; changing thing. Pounded and scoured by the waves which act accord- ing to the tide now at this level and now at that, the surface of the beach trodden by the bather which seems so hard and to the casual eye so unchanging from day to day, is really in a state of constant flux, being now cut down and now built up sometimes to a depth of a few inches and sometimes to a foot or so. This and some of the work that deal


. The edible clams, mussels and scallops of California . Fig. 19. Digging Pismo clams, Oceano. Digger returning with his fork and a "limit" of clams in his "; changing thing. Pounded and scoured by the waves which act accord- ing to the tide now at this level and now at that, the surface of the beach trodden by the bather which seems so hard and to the casual eye so unchanging from day to day, is really in a state of constant flux, being now cut down and now built up sometimes to a depth of a few inches and sometimes to a foot or so. This and some of the work that deals with the wave action has been already referred to. Often during a month or an entire season one kind of action will predominate and the diggers who daily frequent the beach and study it as a sailor does the sea, can point out a stranded buoy or stump or rock now bare, that last season was covered, or which now can barely be seen though before it was conspicuous. Such erosion or filling amounting to several feet is common. Below tides the sand is even more at the mercy of the water. On the broad, gently shelving beaches where the


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