Come over here now!" He seized me by the coat-sleeve in his eagerness, and drew me over to the table at which he had been working.

"Let us have some fresh blood," he said, digging a long bodkin into his finger, and drawing off the resulting drop of blood in a chemical pipette.

"Now, I add this small quantity of blood to a litre of water.

You perceive that the resulting mixture has the appearance of pure water.

The proportion of blood cannot be more than one in a million.