Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 44
cipitation, it is possibleby exhausting the cylinders, and repeating the process, toobtain, with some substances, fifteen or twenty clouds insuccession from a single charge of vapour-laden air. The clouds thus precipitated differ from each other inluminous energy, some shedding a mild white light,… … refraction and reflection. Different clouds, moreover, pos-sess very different degrees of stability ; some melt rapidlyaway, while others linger for minutes in the tube, resting 20 HEAT A MODE OF MOTION. eect. l finally upon its bottom, and disappearing like a dissolvingheap of snow. Nothing can…
Heat
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