Abstract
Present theories of the growth of ice crystals are briefly reviewed. The assumption of Wright and Priestley that ice contains some molecules which move about in the crystals is discussed. An account is given of the method of finding absorption bands in a piece of ice. It was found that the thin region between the ice crystals is highly absorbing. About half of the heat waves were absorbed in the bands of absorption, but in other parts of the infra-red spectrum the layer between the crystals is transparent. This fact is used to explain crystal growth in a solid piece of ice. This theory can be applied to ice in the natural state if proper allowance is made for the existing conditions.
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