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. I had this fellow's stride both on the clay outside
and on the dust within. Then I had a way of checking my
calculation. When a man writes on a wall, his instinct leads
him to write about the level of his own eyes. Now that writing
was just over six feet from the ground. It was child's play."

"And his age?" I asked.

"Well, if a man can stride four and a-half feet without the
smallest effort, he can't be quite in the sere and yellow.
That was the breadth of a puddle on the garden walk which he
had evidently walked across. Patent-leather boots had gone
round, and Square-toes had hopped over. There is no mystery
about it at all. I am simply applying to ordinary life a few
of those precepts of observation and deduction which I
advocated in that article. Is there anything else that