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The authors investigate the applicability of the relationship Nsh = A + B NmReNnSc to determine over-all mass transfer rates in forced convection from single solid spheres, where A, B, m and n are presumed to be constants. This expression is shown to be not entirely adequate and, in particular, the changing importance of the wake with increasing Reynolds number and turbulence in the boundary layer will affect these constants.

Fifty consecutive cases of salivary mucocoeles in dogs were investigated. Twenty-four dogs were presented with both cervical and sublingual mucocoeles; in twenty-three cases a cervical swelling only was noted and in three cases a sublingual mucocoele (ranula) existed on its own. Sialography demonstrated sublingual gland, or duct, defects in forty cases. In seven of the remaining ten cases, normal mandibular sialograms were obtained on the affected side. Bilateral sublingual gland involvement was confirmed by sialography in eight cases and suggested by circumstantial evidence in a further two cases. Surgical excision of the mandibular and sublingual glands on the affected side, combined with drainage of the mucocoele contents, has proved to be a reliable approach to treatment.

SUMMARY Cortisol utilization by salivary glands, kidneys and adrenals of various mammals has been compared by using a standard histochemical technique for the demonstration of hydroxysteroid dehydrogenases. 11β-Hydroxysteroid dehydrogenase activity was localized in salivary gland ducts, renal collecting and convoluted tubules and in the adrenal cortex of some species. There was no obvious relationship between the levels of enzyme activity in the salivary glands, kidneys and adrenals. Neither was the presence of 11β-hydroxysteroid dehydrogenase in salivary glands particularly associated with mucous or serous secretion, nor were sex differences in levels of activity evident.