On 13 Nov 07, at 21:14, carlobal@netzero.net wrote: > Water releasing heat as it freezes is why the citrus growers spray > their groves in times of freezing weather down south... And why some neo-hippy-earth-motherish acquaintances built a solar greenhouse, lean-to style against a south-facing bank ... and put 50 gallon drums of water, painted black, under the benches. -- Rodger Whitlock Victoria, British Columbia, Canada Maritime Zone 8, a cool Mediterranean climate on beautiful Vancouver Island