• Darwin Archive | 'Expression of emotions': photographs and portfolio I | 'Expression of emotions': portfolio I | The diurnal periodic movements which lead to sleep are easily disturbed, too great cold stops them, 1809-01-01 - 1882-04-30 | The diurnal periodic movements which lead to sleep are easily disturbed, too great cold stops them, 1809-01-01 - 1882-04-30

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