内容简介：
There was no sound. She opened the door of the ground-floor bedroom and looked in. All was tidy and pleasant as usual. Every mat lay in its place; the chairs were set against the wall as she loved to see them; the rows of books, the shelves of chemicals, at which she hardly dared to look, and which she never dared to touch for fear something would "go off" and kill her instantly, the specimens in their tall glass jars, the case of butterflies, all were in their place; but there was no sign of life in the room, save the canary in the window.