A detailed description of the crystallisation set up was given in an earlier paper. The set up consisted of a liquid cell that was held by a hollow metal sample holder inside of which water was circulated. The temperature of the circulating water was controlled via an external water bath, whose temperature was balanced between an electric heater and the surrounding ice bath with an accuracy of 0.1 • C. The operation temperature was in the range of 4 • C to 90 • C, and during the experiments described here it was operated between