. Popular science monthly. fig. 7. Crystals of RhojibicSulphur. 28 THE POPULAR SCIENCE MONTHLY The change by which water is transferred to ice and its reverse maybe represented as follows: At 0° ice ^ water. The arrows pointing in opposite directions indicate that the processis reversible. The significance may be expressed as follows: at 0° ice canbe changed to water or water to ice. Similarly in the case of the sulphur, At 96° sulphur (monoclinic) ?=± sulphur (rhombic).. Fig. 8. Organ Pipes that have been Attacked by the Tin Disease. Xow just as the water at 0° does not always change to ice,
. Popular science monthly. fig. 7. Crystals of RhojibicSulphur. 28 THE POPULAR SCIENCE MONTHLY The change by which water is transferred to ice and its reverse maybe represented as follows: At 0° ice ^ water. The arrows pointing in opposite directions indicate that the processis reversible. The significance may be expressed as follows: at 0° ice canbe changed to water or water to ice. Similarly in the case of the sulphur, At 96° sulphur (monoclinic) ?=± sulphur (rhombic).. Fig. 8. Organ Pipes that have been Attacked by the Tin Disease. Xow just as the water at 0° does not always change to ice, but maybe undercooled, so the transformation of monoclinic to rhombic sulphurdoes not take place immediately, but the needles can exist in a meta-stable state analogous to the undercooled water. And as the addition ofa fragment of ice causes undercooled water to solidify, so the addition ofa crystal of rhombic sulphur accelerates the change of monoclinic sul-phur to its stable form. The rapidity of the transformation of themetastable solid, however, is by no means as rapid as the change of meta-stable liquids. This is not surprising when we consider how much moreinert solids are than liquids, especially when considered from a chem-ical standpoint. A most interesting example of the retarded transformation of metals SUSPENDED CHANGES IN NATURE 29 has been furnished by Professor Cohen of Utrecht. Tin is a whitecrystalline metal which does not corrode readily and und
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