time. I applied my stethoscope to
his lungs. There was a very marked congestion, and I made as my working
diagnosis pneumonia. It was a case for quick and heroic action. In a
very few minutes I had a tank of oxygen from the hospital.

"In the meantime I had thought over that sweetish odour, and it flashed
on my mind that it might, after all, be a case of poisoning. When the
oxygen arrived I administered it at once. As it happens, the Rockefeller
Institute has just published a report of experiments with a new antidote
for various poisons, which consists simply in a new method of enforced
breathing and throwing off the poison by oxidising it in that way. In
either case--the pneumonia theory or the poison theory--this line of
action was the best that I could have adopted on the spur of the moment.
I gave him some strychnine to strengthen his heart and by hard work I
had him resting apparently a little easier. A nurse had been sent for,
but had not arrived when a messenger came to me telling of a very sudden
illness of Mrs. Morey, the wife of the steel-magnate. As the Morey home
is only a half-block away, I left Mr. Morowitch, with very particular
instructions to his wife as to what to do.

"I had intended to return immediately, but before I got back Mr.
Morowitch was dead. Now I think I've told you all. You see, it was
nothing but a suspicion--hardly enough to warrant making a fuss about.
I made out the death-certificate, as you see. Probably that would have
been all there was to it if I hadn't heard of this incomprehensible
robbery. That set me thinking again. There, I'm glad I've got it out of
my system. I've thought about it a good deal since your man was here to
see me."

"What do you suspect was the cause of that sweetish odour?" asked
Kennedy.

The doctor hesitated. "Mind, it is only a suspicion. Cyanide of
potassium or cyanogen gas; either would give such an odour."

"Your treatment would have been just the same had you been certain?"

"Practically the same, the Rockefeller treatment."

"Could it have been suicide" asked Andrews.

"There was no motive for it, I believe," replied the doctor.

"But was there any such poison in the Morowitch house?"

"I know that they were much interested in photography. Cyanide of
potassium is used in certain processes in photography."

"Who was interested in photography, Mr. or Mrs. Morowitch?"

"Both of them."

"Was Mrs. Morowitch?"

"Both of them," repeated the do