The puzzle of life and how it has been put together

Madam How and Lady Why; Or, First Lessons in Earth Lore for Children

The Tree-Dwellers

Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place

Days Before history

The First Days of Man, as Narrated Quite Simply for Young Readers

Stories of the Cave People

Thoughts on a Pebble, or, A First Lesson in Geology

Peter Parley's Wonders of the Earth, Sea, and Sky

The Strange Adventures of a Pebble