Abstract
1. The method ofPekarek (1930, 1931) was employed to determine the viscosity of the central vacuolar sap of ovules of monocotyledonous and dicotyledonous plants. The accuracy of this method is about 1%. 2. It has been established that the viscosity of the central vacuolar sap of ovules in the examined plants varies between 1.37 cP to 1.4 cP and shows characteristic changes during the course of their development. These changes are, doubtlessly, connected with a migration of water, monosaccharides and amino acids from vegetative organs into the ovule and subsequently with synthesis of such compounds as polisaccharides and protein in the endosperm.
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