Visible and Invisible

Mr. Tilly had only the briefest moment for reflection, when, as he slipped and fell on the greasy wood pavement at Hyde Park Corner, which he was crossing at a smart trot, he saw the huge traction-engine with its grooved ponderous wheels towering high above him.
"Oh, dear! oh, dear!" he said petulantly, "it will certainly crush me quite flat, and I shan't be able to be at Mrs. Cumberbatch's séance! Most provoking! A-ow!"
The words were hardly out of his mouth, when the first half of his horrid anticipations was thoroughly fulfilled. The heavy wheels passed over him from head to foot and flattened him completely out. Then the driver (too late) reversed his engine and passed over him again, and finally lost his head, whistled loudly and stopped. The policeman on duty at the corner turned quite faint at the sight of the catastrophe, but presently recovered sufficiently to hold up the traffic, and ran to see what on earth could be done. It was all so much "up" with Mr. Tilly that the only thing possible was to get the hysterical engine-driver to move clear. Then the ambulance from the hospital was sent for, and Mr. Tilly's remains, detached with great difficulty from the road (so firmly had they been pressed into it), were reverently carried away into the mortuary...