3 experimentally distinct transverse relaxation components of the water in frog sciatic nerve are obtained by Carr-Purcell-Meiboom-Gill technique. The relative weights of these components: approximately 29%; approximately 50%; approximately 21% fit well with water compartments in this tissue as revealed by previous methods.

The density fluctuations contributing to light scattering in a glass are governed by the fictive temperature of the glass and the equilibrium compressibility of the melt. Using ultrasonic velocity data for KzO-Si02 melts, these compressibilities were evaluated, and the magnitude of the density fluctuations were calculated. In this system, the mean-square amplitude of the fluctuations ,reaches a minimum value (about half that of pure SiO,) for a composition of ~2 0 mol% KzO. By extrapolating the equilibrium compressibilities to zero K20 content, the density fluctuations can be calculated for pure SiOz glass; this calculation agrees well with the result obtained from lightscattering measurements.

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