The shape of the vicinal hills of growth of the (001) face of the TGS single crystal was investigated by a laser Michelson interferometer. It was found that the distribution of the Gibbs activation energy for formation of a kink is not equivalent around the top of the hill.

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Activity of nonparallel center of growth of (001) face of TGS single crystal under inconstant conditions of crystallization hforphologic and kinetic behaviour of the hill of the (001) face of TGS crystal, generated by unparallel dislocation center of growth under inconstant supersaturation and temperature has been experimentally examined. Some irreversible changes in the shape of the hill top, as a hysteresis in its normal rate of growth is registered. A model, on the base of which a qualitative anylsis of the phenomenon is proposed.

Considerable change (up to 100% in one of the cases) of the normal growth rate of hills on the (001) face of the TGS crystal at strictly constant supersaturation and temperature is registered experimentally.On the basis of the spatial disposition of the dislocations, which form the source of the steps, a model of a growth centre (called herein non-parallel centre of growth) is proposed. The model is qualitatively concordant with the experimental data.It is shown that the inconstancy of the normal rate of growth at constant supersaturation and temperature is an immanent characteristic of the non-parallel centre of growth.

The activity of a growth centre, consisting of two transversal screw dislocations with equal Burgers' vectors at constant supersaturation and temperature, is theoretically discussed. A non-linear squared differential equation of the type describing oscillations in autonomous systems is obtained and solved approximately and numerically. The correlation theory -experiment is analysed and the applicability of the results is assessed.