"The very first thing which I observed on arriving there was that a cab had made two ruts with its wheels close to the curb.

Now, up to last night, we have had no rain for a week, so that those wheels which left such a deep impression must have been there during the night.

There were the marks of the horse's hoofs, too, the outline of one of which was far more clearly cut than that of the other three, showing that that was a new shoe.

Since the cab was there after the rain began, and was not there at any time during the morning--I have Gregson's word for that--it follows that it must have been there during the night, and, therefore, that it brought those two individuals to the house." "That seems simple enough," said I; "but how about the other man's height ?" "Why, the height of a man, in nine cases out of ten, can be told from the length of his stride.

It is a simple calculation enough, though there is no use my boring you with figures.