Abstract
A procedure is described which enables ice to be photographed as it forms at an exposed cut surface of plant tissue. Epi-illumination with u.v. light is used to excite the fluorescence of substances applied to the cut surface in aqueous solution. The fluorescer is chosen to have a high quantum yield when absorbed on plant cell walls and when trapped in ice crystals. Time lapse photography using this method shows that the first tissue to freeze in a hardy plant is the vascular system.

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