A dog reflects the family life. Whoever saw a frisky dog in a gloomy family, or a sad dog in a happy one? Snarling people have snarling dogs, dangerous people have dangerous ones.

It is horrible, yet fascinating, this struggle between a set purpose and an utterly exhausted frame.

It was all love on my side, and all good comradeship and friendship on hers. When we parted she was a free woman, but I could never again be a free man.

It is decreed by a merciful Nature that the human brain cannot think of two things simultaneously . . .

From a drop of water a logician could infer the possibility of an Atlantic or a Niagara without having seen or heard of one or the other.

It is, I admit, mere imagination; but how often is imagination the mother of truth?

Far away on the path we saw Sir Henry looking back, his face white in the moonlight, his hands raised in horror, glaring helplessly at the frightful thing which was hunting him down. But that cry of pain from the hound had blown all our fears to the winds. If he was vulnerable he was mortal, and if we could wound him we could kill him. Never have I seen a man run as Holmes ran that night.