This book was written at the request of some of the members of the Browning Society, and was originally intended to be a primer. It bears the marks of this intention in its general scheme, and in the almost abrupt brevity which the desired limits of space seemed to impose on its earlier part. But I felt from the first that the spirit of Mr. Browning's work could neither be compressed within the limits, nor adapted to the uses, of a primer, as generally understood; and the book has naturally shaped itself into a kind of descriptive Index, based partly on the historical order and partly or the natural classification of the various poems.