I think that this book is better in its original german than in english langauge. As to its content, it may perhaps not include all items of this thema, but the items include are treated with genius. The lack of problems to solve may be a draw back, but for me that is not much trouble because there are many books with many problems to solve. The interest of this book lies in its being a source book, though historically written down in 1924, it still mantains its beauty and its present mathematical value.