Sherlock Holmes could deduce much out of the smallest details.

For years past I have continually been conscious of some power behind the malefactor, some deep organising power which forever stands in the way of the law, and throws its shield over the wrong-doer. Again and again in cases of the most varying sorts--forgery cases, robberies, murders--I have felt the presence of this force, and I have deduced its action in many of those undiscovered crimes in which I have not been personally consulted. For years I have endeavoured to break through the veil which shrouded it, and at last the time came when I seized my thread and followed it, until it led me, after a thousand cunning windings, to ex-Professor Moriarty of mathematical celebrity.

We had all listened with the deepest interest to this sketch of the night's doings, which Holmes had deduced from signs so subtle and minute that, even when he had pointed them out to us, we could scarcely follow him in his reasoning.

Tom correctly deduced that Mary was pregnant.

This was the organisation which I deduced, Watson, and which I devoted my whole energy to exposing and breaking up.

We began to see what we can deduce from it.

Again and again in cases of the most varying sorts—forgery cases, robberies, murders—I have felt the presence of this force, and I have deduced its action in many of those undiscovered crimes in which I have not been personally consulted.

How in the world did you deduce that?" I asked.

I deduced a new theory.

What should we deduce from Aristotle's assertion that women have fewer teeth than men: that he had small knowledge of women or that he couldn't count?