This work she did in the truest spirit of love and devotion.

She had a power, moreover, of keeping her husband up to what he had to do.

She contended wisely against a sort of energetic indolence which characterised him, and which, while he was always labouring, made him apt to put aside the task actually before him--sometimes diverted by subjects of inquiry suggested in the course of study on the matter in hand, sometimes discouraged by the difficulty of reducing to order the immense mass of materials he had accumulated in connection with it.

Then her resolution and cheerful disposition sustained and refreshed him, and never more so than when, during the last twelve years of his life, his bodily strength was broken, and his spirit, though languid, yet ceased not from mental toil.

The truth is, that Sir William's marriage, his comparatively limited circumstances, and the character of his wife, supplied to a nature that would have been contented to spend its mighty energies in work that brought no reward but in the doing of it, and that might never have been made publicly known or available, the practical force and impulse which enabled him to accomplish what he actually did in literature and philosophy.