And suddenly they all sprang up, with one movement, and the same expression of surprise.

A bell had rung.

They at once heard where the sound came from.

"The telephone," M. Desmalions muttered.

He took down the receiver.

"Hullo! Who are you?"

A voice answered, but so distant and so faint that he could only catch an incoherent noise and exclaimed:

"Speak louder! What is it? Who are you?"

The voice spluttered out a few syllables that seemed to astound him.

"Hullo!" he said. "I don't understand. Please repeat what you said. Who is it speaking?"