“You understand,” he concluded after a lengthy statement of confession and avoidance, “we have no very good laboratory facilities of our own to carry out the necessary chemical, pathological, and bacteriological investigations in cases of homicide and suicide.  We are often forced to resort to private laboratories, as you know in the past when I have had to appeal to you.  Now, Professor Kennedy, if we might turn over that research part of the case to you, sir, I will engage to see that a reasonable bill for your professional services goes through the office of my friend the city comptroller promptly.”

Craig snapped at the opportunity, though he did not allow the coroner to gain that impression.

“Very well,” agreed that official, “I shall see that all the necessary organs for a thorough test as to the cause of the death of this woman are sent up to the Chemistry Building right away.”

The coroner was as good as his word, and we had scarcely breakfasted and arrived at Craig’s scientific workshop before that official appeared, accompanied by a man who carried in uncanny jars the necessary materials for an investigation following an autopsy.

Kennedy was now in his element.  The case had taken an unexpected turn which made him a leading factor in its solution.  Whatever suspicions he may have entertained unofficially the night before he could now openly and quickly verify.

He took a little piece of lung tissue and with a sharp sterilised knife cut it up.  Then he made it slightly alkaline with a little sodium carbonate, talking half to us and half to himself as he worked.  The next step was to place the matter in a glass flask in a water bath where it was heated.  From the flask a Bohemian glass tube led into a cool jar and on a part of the tube a flame was playing which heated it to redness for two or three inches.

Several minutes we waited in silence.  Finally when the process had gone far enough, Kennedy took a piece of paper which had been treated with iodised starch, as he later explained.  He plunged the paper into the cool jar.  Slowly it turned a strong blue tint.

Craig said nothing, but it was evident that he was more than gratified by what had happened.  He quickly reached for a bottle on the shelves before him, and I could see from the label on the brown glass that it was nitrate of silver.  As he plunged a little in a test-tube into the jar a strong precipitate was gradually formed.

“It is the decided reaction for chloroform,” he exclaimed simply in reply to our unspoken questions.

“Chloroform,” repeated the coroner, rather doubtfully, and it was evident that he had expected a poison and had not anticipated any result whatever from an examination of the lungs instead of the stomach to which he had confined his own work so far.  “Could chloroform be discovered in the lungs or viscera after so many days?  There was one famous chloroform case for which a man is now serving