The _Fourth Part_ describes, as its main themes, the work which Miss Nightingale did, concurrently with that described in the preceding Part, as Hospital Reformer and the Founder of Modern Nursing. Other chapters introduce two topics which might at first sight seem widely separate, but which were yet closely associated in Miss Nightingale's mind. They deal with her, respectively, as a Passionate Statistician and as a Religious Thinker. The nature of her speculations is fully explained in the latter chapters, and elsewhere in the memoir. It will be seen that Miss Nightingale had thought out a scheme of religious belief which widely differed from the creeds of Christian orthodoxy, whether Catholic or Protestant, but which yet admitted of accommodation to much of their language and formularies. It admitted also, as will appear in due course, of close alliance with mysticism. Miss Nightingale believed intensely in a Personal God and in personal religion. The language which expressed most adequately to her the sense of union with God was the language of the Greek and Christian mystics. But "law" was to her "the thought of God"; union with God meant co-operation with Him towards human perfectibility; and for the discovery of "the thought of God" statistics were to her mind an indispensable means. * * * * * In the _Fifth Part_ we are introduced to a new interest in Miss Nightingale's life, a new sphere of her work. For forty years she worked at Indian questions. She took up the subject at first through interest in the army. It was a natural supplement to her efforts for the health of the British soldier at home, to make a like attempt on behalf of the army in India. Gradually she was drawn into other questions, and she became a keen Indian reformer all along the line. Her assiduity, her persistence, her ingenuity were as marked in this sphere as in others; it was only her immediate success that was less.