He stretched his neck.

Yes, there was something.
"It's a man.

God save us--was it murder ?" said Jo Portugais, and shuddered.

"Was it murder ?" The body moved more swiftly than the raft.

There was a hand thrust up--two hands.
"He's alive!" said Jo Portugais, and, hurriedly pulling round his waist a rope tied to a timber, jumped into the water.
Three minutes later, on the raft, he was examining a wound in the head of an insensible man.
As his hand wandered over the body towards the heart, it touched something that rattled against a button.