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76 and the Captain turned the periscope gently round until he got the exact direction. Absolute stillness brooded over the ground he could see; a few rough strands of wire straggled about, and disappeared into the great mound of earth that formed the débris of the crater.

There were the enemies' trenches—a railway embankment behind them with a derelict row of trucks—a great chimney, gaunt and desolate, with the buildings at its foot in ruins. But it was not on these old friends that he was concentrating; his target was the bit of ground just in front of him that lay close to the thrown-up earth of Vesuvius, along which the German sap was reputed to be creeping nearer.

At last he got what he wanted. Close at hand, perhaps twenty yards away, there stuck up out of the ground a motionless stick with something on the end—the German's periscope. Now it is reputed to be a fact by several people of apparent truthfulness that it is possible, in circumstances such as these, for each watcher to see the other man's eyes reflected from the mirrors of the periscopes; and it is an undoubted fact that the laws which govern the refraction of light would allow of this phenomenon. Personally, I am glad to say I have never seen a German's eye through a periscope; but then personally I am inclined to doubt if any one has. It must be quite dreadful to see a thing like a poached egg regarding you balefully from the top of a stick a few yards away.