On some beaches around the world, dry sand will make a singing, squeaking, whistling, or barking sound if a person scuffs or shuffles their feet with sufficient force. The phenomenon is not completely understood scientifically, but it has been found that quartz sand will do this if the grains are very well-rounded and highly spherical. It is believed by some that the sand grains must be of similar size, so the sand must be well sorted by the actions of wind and waves, and that the grains should be close to spherical and have dust-, pollution-, and organic-matter-free surfaces. The "singing" sound is then believed to be produced by shear as each layer of sand grains slides over the layer beneath it. The similarity in size, the uniformity, and the cleanness mean that grains move up and down in unison over the layer of grains below them. Even small amounts of pollution on the sand grains reduces the friction enough to silence the sand.

Experts of the United States fish commission have made a special study of the conditions under which oysters grow, and, to illustrate the adaptability of the mollusks, they have got together a very curious collection of objects. It comprises oysters growing upon a great variety of things, such as old boots, rubber shoes, beer glasses, and even a lantern. There is a broken bottle inside of which, as well as on the outside, oysters have found a home.

And, oddest of all, there is an upper set of false teeth to which an enterprising oyster is firmly attached.

The history of this last oyster is decidedly interesting. About four years ago it was raked out of the waters of Chesapeake bay by a dredging boat, together with the false teeth to which it was firmly fixed, and teeth and oyster were acquired by a hotel keeper at Cowart, Va., whose wife forwarded them to the Smithsonian Institution at Washington. The matter obtaining some advertisement, a man named Webster, residing in Bedford, Iowa, claimed the teeth, saying that he had lost them from a steamer bound for Norfolk.

The Smithsonian officials were undecided at first as to whether they should surrender the teeth or not, the object being so great a curiosity that they were anxious to hold on to it. But not many days later a Philadelphia woman claimed them, asserting that they were hers, and actually a third party, visiting the institution, demanded them, declaring that he recognized them as having been lost by himself.

Probably, from first to last, a good many persons have lost their false teeth overboard in the Chesapeake, the waters of which are liable to be pretty rough at times. Any way, the government scientists did not care to decide the dispute, and concluded to retain the specimen.