Abstract
The weighted SchiOtz tonometer, an instrument used in ophthalmology for estimation of intraocular pressure through measurement of ocular tension, was used in studies on internal pressure and shell-membrane characteristics of freshwater turtle eggs of five species. The descriptive value of graphic profiles of egg tension portrayed by tonometry was demonstrated. Correlated tonometric and manometric studies on the same eggs provided a means of giving pressure values to tonometer readings, and of differentiating structural and pressure factors in tonometer measurement of egg tension. Impression tonometry is suggested as a technique for both field and laboratory monitoring of physical changes in reptilian eggs.
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