Abstract

IN connection with Miss Buckland's letter on this subject it may be interesting to note that, during a visit to Orotava, Teneriffe, in April 1887 (about the time mentioned by your correspondent), I observed and gathered a quantity of pumice-stone upon the seashore, the high tide mark being literally strewed with it. It seemed probable that it had been deposited there some weeks or possibly months previously, as, had there been any quantity floating about in the sea, I should have noticed it, being engaged at the time tow-netting in the neighbourhood and in the adjacent Canary Islands. There was no evidence of vegetable debris having accompanied the pumice, nor did I notice any pieces with barnacles attached.

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