Pages are tight and clean. Boards have shelfwear and rubbing, especially to the spine. FFEP missing. No DJ. Library discard with usual marks and attachments. Illustrated. 248 pages. HardCover Binding. Year: 1929. ISBN: 0. Aims to present in story form a type of information which children of the upper elementary grades naturally seek. Scientific phenomena, processes by which raw materialis converted into forms for human use, elementary facts in physics and chemistry-these arouse curiosity and stimulate a desire for knowledge.