  The statistics of liquid-to-crystal nucleation are measured for both water
and for clathrate-forming mixtures of tetrahydrofuran (THF) and water using an
automatic lag time apparatus (ALTA). We measure the nucleation temperature
using this apparatus in which a single sample is repeatedly cooled, nucleated
and thawed. The effect of stirring on nucleation has been evaluated numerically
and is discussed. We find that stirring of the solution makes no difference to
the nucleation temperature of a given solution in a given tube.
