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238 merely sulphate of iron. The house in Chester Square had been given up in 1848, and another was taken at 77, Warwick Square, before the marriage of Sir Percy, and thence at the end of that year Mary writes of an improvement in her health, but there was still a tendency to neuralgic rheumatism. The life-long nerve strain for a time was relaxed, but without doubt the tension had been too strong, and loving care could not prevail beyond a certain point. The next year the son and his wife took the drooping Mary to Nice for her health, and a short respite was given; but the pressure could not much longer remain. The strong brain, and tender, if once too impassioned heart, failed on February 21, 1851, and nothing remained but a cherished memory of the devoted daughter and mother, and the faithful wife of Shelley.