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    • Pigments of Fresh-water Triclads - Nature

      Nature· 2 days ago

      WITH reference to a previous communication1 in which it was suggested that the colours of Polycelis nigra and Planaria lugubris are due to different depositions of melanin in the skin, the fact ...

    • The Fresh-Water Pearls of America - Nature

      Nature· 3 days ago

      THE production of pearls by numerous species belonging to the fresh-water bivalve family Unionidae has been a matter of common knowledge from time immemorial ...

    • On the Freezing of Lakes1 - Nature

      Nature· 2 days ago

      IN pursuance of investigations, now extending over some years, into the natural conditions of our seas and lakes, I took advantage of the recent frost to make-some—thermometric observations ...

    • Landslips - Nature

      Nature· 2 days ago

      In certain districts in the immediate neighbourhood of Northwich the ground is completely honeycombed with rock-salt mines that had been worked out and abandoned. Into many of these