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action animal apparatus arctic atheism atmosphere balance barometer beam body bulb candle cause charge climate cocoon silk condensed connected cumulus clouds Darwin discharge disks earth electricity electroscope evidence experiment fact force Glacial glaciers grain Greenland heat heat-rays hemisphere horizontal Ice period ignited inches instrument knob Leyden-jar lowest barometer magnet ment metal Mivart mouse move movement natural nest northern northern hemisphere northward oath observations ordeal oscillation outer coating phenomena pith pith-bar plane of conflict plane of meeting polar current present principle produced Prof radiation radiometer rays region religion religious rotation Rumford medals scientific scorpion side spark species Sprengel pump standard candle storm stratus clouds Sunday surface swear temperature Tertiary theory thymol tin-foil tion tornado torsion torsion balance tropical current truth tube warm weight winter wire young birds