They had left Louisa beginning to sit up; but her head, though clear, was exceedingly weak, and her nerves susceptible to the highest extreme of tenderness; and though she might be pronounced to be altogether doing very well, it was still impossible to say when she might be able to bear the removal home; and her father and mother, who must return in time to receive their younger children for the Christmas holidays, had hardly a hope of being allowed to bring her with them.
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susceptible to colds
Not being susceptible to contradicting evidence, it is not a testable hypothesis.