Abstract
The ordinary (second-order) elastic constants determine the velocity of ultrasonic waves in solids, and hence have been evaluated fromvelocity measurements in many solids under a wide range of conditions. They are ubiquitous, appearing in virtually any theory or experiment which quantitatively describes the (linear) elastic behavior of solids. are equally fundamental, equally ubiquitous recently, and are being measured for similar reasons: to form a basis for describing the nonlinear (elastic) behavior of solids. The TOE constants are discussed, withemphasis on cubic symnetry, with the intention of relating them to other non1 inear observables (anharmonicity,
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