This book is a collection of notes and correspondences in the life of Jean Louis Rodolphe Agassiz. Agassiz was a Swiss-born American biologist and geologist who is recognized as a scholar of Earth's natural history. Agassiz is known for his regimen of observational data gathering and analysis. He made vast institutional and scientific contributions to zoology, geology, and related areas, including writing multivolume research books running to thousands of pages.