'The Elements of Botany, For Beginners and For Schools' by Asa Gray is a comprehensive and concise guide to the principles of botany. It covers topics like structural botany, the principles of vegetable life, and the morphology of seedlings. The author emphasizes that learning botany is not about memorizing terms and names but about gaining knowledge and ideas. The book also includes a glossary that explains many unusual or obsolete terms and Latin and Greek words that form the commoner specific names, and covers the anatomy of roots, stems, and leaves, and plant food and assimilation, and the movements in plants.