circumstances in which we find it. These are thick concave spectacle-lenses broken into a great number of minute fragments. Now how were they broken? Not merely by falling, evidently: such a lens, when it is dropped, breaks into a small number of large pieces. Nor were they broken by the wheel passing over them, for they would then have been reduced to fine powder, and that powder would have been visible on the rail, which it is not. The spectacle-frames, you may remember, presented the same incongruity: they were battered and damaged more than they would have been by falling, but not nearly so much as they would have been if the wheel had passed over them."
"What do you suggest, then?" I asked.
"The appearances suggest that the spectacles had been trodden on. But, if the body was carried here the probability is that the spectacles were carried here too, and that they were then already broken; for it is more likely that they were trodden on during the struggle than that the murderer trod on them after bringing them here. Hence the importance of picking up every fragment."
"But why?" I inquired, rather foolishly, I must admit.
"Because, if, when we have picked up every fragment that we can find, there still remains missing a larger portion of the lenses than we could reasonably expect, that would tend to support our
