also notice that they pass along the backs of the trees—outside the avenue, that is; what does that suggest to you?"
"It suggests to me," I said, when the inspector had shaken his head hopelessly, "that there was possibly someone in the avenue when the man was stealing off."
"Precisely," said Thorndyke. "The body was found not more than nine minutes after Pratt arrived here. But the murder must have taken some time. Then the housekeeper thought she heard some one calling and came out with a lantern, and, at the same time, the general and Mr. Hanford came up the drive. The suggestion is that the man sneaked along outside the trees to avoid being seen. However, let us follow the tracks. They pass the elm and they pass on behind the next tree; but wait! There is something odd here." He passed behind the great pollard oak and looked down at the soft earth by its roots. "Here is a pair of impressions much deeper than the rest, and they are not a part of the track since their toes point towards the tree. What do you make of that?" Without waiting for an answer he began closely to scan the bole of the tree and especially a large, warty protuberance about three feet from the ground. On the bark above this was a vertical mark, as if something had scraped down the tree, and from the wart itself a dead
