Sir Christopher's look was enough.

Mr.Bates said nothing, but hurried along by his side, while Rupert dashed forward among the dead leaves with his nose to the ground.

They had scarcely lost sight of him a minute when a change in the tone of his bark told them that he had found something, and in another instant he was leaping back over one of the large planted mounds.

They turned aside to ascend the mound, Rupert leading them; the tumultuous cawing of the rooks, the very rustling of the leaves, as their feet plunged among them, falling like an evil omen on the Baronet's ear.
They had reached the summit of the mound, and had begun to descend.

Sir Christopher saw something purple down on the path below among the yellow leaves.