“How on earth did you know that?” I asked in astonishment.
“Never mind,” said he, chuckling to himself. “The question now is about haemoglobin. No doubt you see the significance of this discovery of mine?”
“It is interesting, chemically, no doubt,” I answered, “but practically—”
“Why, man, it is the most practical medico-legal discovery for years. Don’t you see that it gives us an infallible test for blood stains? 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. I