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<br />Plate xv. Ice crystals of differing shapes growing on a mament suspended in a diffusion <br />chamber with controUed temperature gradient. The crystals take characteristic forms <br />at different temperatures as indicated along the right edge of the photograph. Reading <br />from the top, the symbols represent: thin hexagonal plates, needles, hollow prismatic <br />columns, hexagonal plates, branched fern-like crystals (or dendrites), and hexagonal <br />plates.. At temperatures below - 25 oC, prisms appear again. <br /> <br /> <br /> <br />( <br /> <br />I <br />I <br />l <br /> <br />"I, <br />W <br />Ii <br />~i <br />~i <br />~ <br />, <br />j' , <br />. <br />;( <br /> <br />( <br /> <br />\ <br />~, : <br />1 . <br />\ ' <br />'f <br />\ <br />j <br />t' <br />I <br />:~! <br />j'l <br />t <br />I'" . <br />$;'~ <br />;','! <br />l' <br />I <br />I <br />I: <br />I', <br />Iii <br />I! <br />I <br />I <br />I <br />I <br />I' ! <br /> <br />, ' <br />. 'I <br /> <br />o <br /> <br />-3oe <br /> <br />~ ~ <br /> <br />~ <br /> <br />-5oe <br /> <br />~ <br /> <br />c <br /> <br />-8oe' <br /> <br />o p <br /> <br />-120 e <br />