The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee

"The Manual of the Botany of the Northern United States" by Asa Gray is a scientific guide that explores the plant life in the eastern and northern parts of the United States. The writer puts a lot of focus on botany, and the book is very detailed and educational, providing descriptions and classifications of many different plants that grow in the United States. In the manual's early pages, the preface tells how the book has changed over several versions, noting the additional findings and revisions by the current editors. It stresses the importance of keeping Dr. Gray's ideas and methods alive, and that the editors are committed to preserving the high standards of past versions.