The book has no illustrations or index. It may have numerous typos or missing text. However, purchasers can download a free scanned copy of the original rare book from the publisher's website (GeneralBooksClub.com). You can also preview excerpts of the book there. Purchasers are also entitled to a free trial membership in the General Books Club where they can select from more than a million books without charge. Original Publisher: Boston: D.C. Heath; Publication date: 1911; Subjects: Lie groups; Differential equations; Continuous groups; Mathematics / Algebra / General; Mathematics / Algebra / Abstract; Mathematics / Algebra / Linear; Mathematics / Differential Equations; Mathematics / Group Theory;