We want to lead the child from results back to causes. The possession of a vast number of facts, unrelated among themselves, is valueless and even harmful, for the child does not look upon nature as a whole. Nature-study, perhaps more than any other subject, leads the child into sympathy with his environment. He observes carefully and thoughtfully and thus the individual is developed. From personal contact with nature he gains the power of accurate observation, correct thinking and judgment; thus strengthening his moral character. If this is the effect of nature-study upon the development of the child, the question comes to the librarian--What principles shall guide me in the selection of books that the library with which I am connected may be of assistance in accomplishing these results, and meet the demand of modern education? A book for children should be attractive. The exterior should present a harmony of color and tasteful decoration. The text should be printed with clear type upon good paper and should be well illustrated. Colored plates are preferable, provided the coloring is good, otherwise uncolored illustrations are far more desirable. The text should be clear, simple, and scientifically correct. The new scientific book differs from the old. The old style book gave dead results, no sympathy in or interest for life was aroused, no suggestions were given for first-hand observations of nature, consequently the book failed to stimulate a desire for personal investigation that could be verified by the recorded work of others. The new scientific book not only gives results but a detailed account of the methods employed in obtaining those results. The reader is interested in trying the same experiments, gains a sympathy and interest in the wonderful life history of a plant, bird, or insect, develops a tenderness for life and feels that all nature is a sympathetic unit.