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Sturtevant did most of his experiments in his head , sitting with his feet on his desk and his pipe in his mouth . Some of them would creep into her lap and purr till the comfortable sound soothed her irritation ; the sedate elders sat at her feet blinking with such wise and sympathetic faces , that she felt as if half a dozen Solomons were giving her the sagest advice ; while the kittens frisked about , cutting up their drollest capers till she laughed in spite of herself .