Abstract
Changes of the dynamic viscosity, surface tension and density of the central vacuolar sap which take place during the development of the ovules (dicotyledonous plants A. pavia and A. glabra) have been examined. It has been established that in young ovules ( A. pavia) the dynamic viscosity of the sap slowly decreases from 1.080 to 1.045 cP; in almost fully grown ovules (with intensively growing embryos) it increases rapidly from 1.045 to 1.475 cP (Fig. 1; curve I). In young ovules the surface tension initially decreases from 68.8 to 67.9 and subsequently increases to 69.0 dynes/ cm. A drop of the surface tension to 62.5 dynes/cm (Fig. 1, curve III) is characteristic of ovules with intensively growing embryos. The density of the central vacuolar sap decreases during the whole period of development of the ovules from 1.028 to 1.019 g/cm 3 (Fig. 2, curve I).
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