He was hit hard under the ear, and went reeling, trying to face round towards his unseen antagonist.  He just managed to keep his feet, and he struck a vain counter in the air.  Then he was hit again under the jaw, and sprawled headlong on the ground.  In another moment a knee compressed his diaphragm, and a couple of eager hands gripped his throat, but the grip of one was weaker than the other; he grasped the wrists, heard a cry of pain from his assailant, and then the spade of the navvy came whirling through the air above him, and struck something with a dull thud.  He felt a drop of moisture on his face.  The grip at his throat suddenly relaxed, and with a convulsive effort, Kemp loosed himself, grasped a limp shoulder, and rolled uppermost.  He gripped the unseen elbows near the ground.  “I’ve got him!” screamed Kemp.  “Help!  Help—­hold!  He’s down!  Hold his feet!”

In another second there was a simultaneous rush upon the struggle, and a stranger coming into the road suddenly might have thought an exceptionally savage game of Rugby football was in progress.  And there was no shouting after Kemp’s cry—­only a sound of blows and feet and heavy breathing.

Then came a mighty effort, and the Invisible Man threw off a couple of his antagonists and rose to his knees.  Kemp clung to him in front like a hound to a stag, and a dozen hands gripped, clutched, and tore at the Unseen.  The tram conductor suddenly got the neck and shoulders and lugged him back.

Down went the heap of struggling men again and rolled over.  There was, I am afraid, some savage kicking.  Then suddenly a wild scream of “Mercy!  Mercy!” that died down swiftly to a sound like choking.

“Get back, you fools!” cried the muffled voice of Kemp, and there was a vigorous shoving back of stalwart forms.  “He’s hurt, I tell you.  Stand back!”

There was a brief struggle to clear a space, and then the circle of eager faces saw the doctor kneeling, as it seemed, fifteen inches in the air, and holding invisible arms to the ground.  Behind him a constable gripped invisible ankles.

“Don’t you leave go of en,” cried the big navvy, holding a blood-stained spade; “he’s shamming.”

“He’s not shamming,” said the doctor, cautiously raising his knee; “and I’ll hold him.”  His face was bruised and already going red; he spoke thickly because of a bleeding lip.  He released one hand and seemed to be feeling at the face.  “The mouth’s all wet,” he said.  And then, “Good God!”

He stood up abruptly and then knelt down on the ground by the side of the thing unseen.  There was a pushing and shuffling, a sound of heavy feet as fresh people turned up to increase the pressure of the crowd.  People now were coming out of the houses.  The doors of the “Jolly Cricketers” stood suddenly wide open.  Very little was said.

Kemp felt about, his hand seeming to pass through empty air.  “He’s not breathing,” he said, and then, “I can’t feel his heart.  His side—­ugh!”