The general effect of this book is very original and attractive. Throughout are fascinating maps, superimposing one level of earth changes upon another, and in themselves teaching a good deal to anyone who will study them closely. Helene Carter has done a good piece of work... The text, however, lacks sparkle and zest, and fails to catch the interest of anyone not already interested profoundly in the subject of the geologic history of the world. Vocabulary not gauged to children; length of type line overlong; nothing particularly different in presentation.