There was a great extension during these years of societies for the training of nurses, and of the introduction of trained nurses into infirmaries and other institutions. All this involved a large addition to Miss Nightingale's correspondence. As the nursing system extended, many questions arose with regard to the relation between the medical and the nursing staffs, and she was constantly referred to for suggestions and advice. She printed a code of "Suggestions" in 1868 dealing with such matters,[118] and three years later she and Dr. Sutherland drew up a Code for Infirmary Nursing which was approved by Mr. Stansfeld, the President of the newly-formed Local Government Board. Her correspondence was as extensive with individuals as with institutions. Hundreds of girls who thought of becoming nurses applied to her, and she generally answered their letters; but the supply of nurses barely kept pace with the demand. Miss Nightingale was impressed in particular by the lack of suitable applicants for the higher posts. There were many women anxious to take up nursing as a profession. There were few who possessed the social standing, the high character, trained intelligence, and personal devotion which were necessary to make them successful Lady Superintendents; and much of Miss Nightingale's correspondence during these years was to friends in various parts of the country who were begged to enlist promising recruits. [118] Bibliography A, No. 49 (note). II Among the women who sought out Miss Nightingale for advice were Queens and Princesses. She guarded very jealously, however, the seclusion which was necessary to enable her to do her chosen work, and she did not allow it to be invaded at will even by the most exalted personages. Her position as a chronic invalid gave her the advantage. She could pick and choose by feeling a little stronger or a little weaker. She made two rules which she communicated to her influential friends. She would not be well enough to see any Queen or Princess who did not take a personal and practical interest in hospitals or nursing; and she would never be well enough to receive any who did not come unattended by ladies or lords in waiting. Any interview must be entirely devoid of ceremonial; it must be simply between one woman interested in nursing and another. In 1867 the Queen of Prussia was paying a visit to the English court, and Queen Victoria asked Miss Nightingale through Sir James Clark to see Queen Augusta. Miss Nightingale was assured that the Queen had given much personal attention to hospitals. Miss Nightingale saw her (July 6) and found that the assurances were well founded:--