Opening the gate he went to the outside of the wall. A grass plot ran alongside it here and the Inspector, stooping down, searched for corresponding marks. He was not disappointed. Two much deeper depressions showed where the ends of the ladder-like apparatus had sunk into the softer ground. These were not narrow like those in the yard, but rectangular and of heavier stuff, three inches by two, he estimated. He looked at the plaster on the wall above, but it was not till he examined it through his lens that he was satisfied it bore two faint scratches, corresponding in position to the muddy marks on the opposite side. A further thought struck him. Scooping up a little soil from the grass, he went again into the yard and compared with his lens the soil and the dry mud of the marks on the plaster. As he had anticipated, they were identical. He could now dimly reconstruct what had happened. Some one had placed a peculiar kind of ladder against the outside of the wall and presumably crossed it and opened the gate. The ladder had then been carried round and placed against the inside of the wall, but, probably by accident, _opposite end up_. The outside plaster was therefore clean but scraped, while that on the inside bore traces of the soil from the ends that had stood on the grass. In going out after barring the gate, he imagined the thief had pulled the ladder after him with a cord and passed it over the wall. The Inspector returned to the grass and made a further search. Here he found confirmation of his theory in a single impression of one of the legs of the ladder some two feet six out from the wall. That, he decided, had been caused by the climber throwing down the ladder when leaving the yard. He also found three footmarks, but, unfortunately, they were so blurred as to be valueless. He took out his notebook and made a sketch with accurate dimensions showing what he had learnt of the ladder--its length, width, and the shape of the legs at each end. Then bringing out the steps Felix had used to hang the chain blocks, he got on the wall. He examined the cement coping carefully, but without finding any further traces. The yard, being paved, no wheel or footmarks were visible, but Burnley spent quite a long time crossing and recrossing it, examining every foot of ground in the hope of finding some object that had been dropped. Once before, in just such another case, he had had the luck to discover a trouser button concealed under some leaves, a find which had led to penal servitude for two men. On this occasion he was disappointed, his search being entirely unsuccessful.