Sand, Musical, sand which, under certain conditions, gives out a musical sound. The phenomenon occurs on sea-beaches in many localities in different parts of the world. The most striking is in the district of Mana, on the S. coast of Kauai, Hawaii. Owing to a fancied resemblance of the sound emitted by the sand in that locality to a dog's bark, the Kauai musical sand is known as "barking" sand.
Entry from Everybody's Cyclopedia, 1912.