As Public Health Missionary for India, Miss Nightingale made the state of the town of Madras a text for constant exhortations. Madras ranked at that time second for unhealthiness among the great cities of India (Delhi being first[168]). Whereas the death-rate in Calcutta and in Bombay was falling, in Madras it was rising.[169] Miss Nightingale, like every other sanitary expert who had examined the facts, ascribed the high rate of mortality to the deplorable state of the drains; and there were Indian officials, both in London and in India, who turned to her in the hope that she might be able to stir up the higher authorities to insist on something being done. Her friend, Mr. Clark, had devised a scheme; either it should be carried out, or a better one should be substituted. On this subject there is a long correspondence amongst her Papers; and as her principal correspondent was Lord Salisbury, it is not devoid of dry humour. Lord Salisbury confessed that the subject was beyond him; all he could clearly ascertain was that there were as many different opinions as there were persons professing to understand it; but he had good news for his correspondent. The next Governor of Madras was to be the Duke of Buckingham, and the Duke had a curious passion for details. He might be expected, it seemed to be suggested, to take to drains like a rat. So Miss Nightingale waited, and presently Lord Salisbury was sent to the Constantinople Conference on the Eastern Question. At Madras nothing had come of the Duke's love of detail; and as soon as Lord Salisbury returned to England, Miss Nightingale returned to the charge. Lord Salisbury sent her memorandum of suggestions to the Duke, and in due course forwarded to her the Duke's reply (of July 24, 1877). The Governor was studying the question closely, and Lord Salisbury hoped that Miss Nightingale would be pleased. True, there was delay; but then, as he had previously written to her, "The period of growth of all projects in India, in point of length, savours much of the periods of Indian cosmogony." "I think you will be satisfied," he now wrote (Aug. 22), "that the Governor of Madras is giving his mind very heartily to the question; and that his previous experience, and the kind of observations into which his singular taste for detail has guided him, have given him some special qualifications for coming to a right decision." And then came what in a postscript to the High Priestess of sanitation might be thought a "blazing indiscretion," if it were not obviously a piece of teasing: "I was much impressed at Constantinople with the advantage of having no drains at all, but keeping dogs instead." I am afraid that from the moment of the receipt of this letter Miss Nightingale's opinion of Lord Salisbury fell; but she was not to be shaken off, and, in consultation with Dr. Sutherland (with hints, too, from an Indian official), she sent a reasoned reply to Lord Salisbury,