1921. Illustrated. The fourth year of school involves for the pupil many experiences for which he needs expression. He finds a need for new words. This need must be supplied if his natural growth is not to be crippled. This second book of Nature Study is not only meant to supply new words for this need, but, in a real sense, to create a need. New words should be taught only when there is a need for them. The intention of this text is to develop an increased interest on the part of the pupil in Nature and to stimulate children to a more careful observation and investigation of their environment.