Bereft of his glorious mane the lower part of his face was heavily jowled and ham-shaped, while his whole appearance was that of an old fighting gladiator, battered and bulging, with the jaws of a bulldog over a massive chin.

It may have been some look upon our faces – I have no doubt that the evil grin of my companion had widened at the sight – but, however that may be, Challenger's hand flew up to his head and he became conscious of his condition. The next instant he had sprung out of his chair, seized the inventor by the throat, and had hurled him to the ground. Knowing Challenger's immense strength I was convinced that the man would be killed.

'For God's sake be careful. If you kill him we can never get matters right again!' I cried.

That argument prevailed. Even in his maddest moments Challenger was always open to reason. He sprang up from the floor, dragging the trembling inventor with him. 'I give you five minutes,' he panted in his fury. 'If in five minutes I am not as I was, I will choke the life out of your wretched little body.'

Challenger in a fury was not a safe person to argue with. The bravest man might shrink from him, and there were no signs that Mr. Nemor was a particularly brave man. On the contrary, those blotches and warts upon his face had suddenly become much more conspicuous as the face behind them changed from the colour of putty, which was normal, to that of a fish's belly. His limbs were shaking and he could hardly articulate.

'Really, Professor!' he babbled, with his hand to his throat, 'this violence is quite unnecessary. Surely a harmless joke may pass among friends. It was my wish to demonstrate the powers of the machine. I had imagined that you wanted a full demonstration. No offence, I assure you. Professor, none in the world!'

For answer Challenger climbed back into the chair.

'You will keep your eye upon him, Malone. Do not permit any liberties.'

'I'll see to it, sir.'

'Now then, set that matter right or take the consequences.'

The terrified inventor approached his machine. The reuniting power was turned on to the full, and in an instant, there was the old lion with his tangled mane once more. He stroked his beard affectionately with his hands and passed them over his cranium to be sure that the restoration was complete. Then he descended solemnly from his perch.

'You have taken a liberty, sir, which might have had very serious consequences to yourself. However, I am content to accept your explanation that you only did it for purposes of demonstration. Now, may I ask you a few direct questions upon this remarkable power which you claim to have discovered?'

'I am ready to answer anything save what the source of the power is. That is my secret.'

'And do you seriously inform us that no one in the world knows this except yourself?'

'No one has the least inkling.'

'No assistants?'

'No, sir. I work alone.'

'Dear me! That is most interesting. You have satisfied me as to the reality of the power, but I do not yet perceive its practical bearings.'

'I have explained, sir, that this is a model. But it would be quite easy to erect a plant upon a large scale. You understand that this acts vertically. Certain currents above you, and certain others below you, set up vibrations which either disintegrate or reunite. But the process could be lateral.