THE PHYSICAL ENERGY oi THE HOUSE-FLY. Bluebottle Hy balancing a cork ball upon which another fly is simultaneously preserving its balance. A fly walking up a revolving wheel. Bluebottle fly turning a revolving wheel. Eating honey from a pin held in the hand. THE PHYSICAL ENERGY OF THE HOUSE-FLY. The Current Supplement., scientific american, -1909-02-06

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THE PHYSICAL ENERGY oi THE HOUSE-FLY. Bluebottle Hy balancing a cork ball upon which another fly is simultaneously preserving its balance. A fly walking up a revolving wheel. Bluebottle fly turning a revolving wheel. Eating honey from a pin held in the hand. THE PHYSICAL ENERGY OF THE HOUSE-FLY. The Current Supplement., scientific american, -1909-02-06

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