"Yes," he answered. "It was standing on her dressing-table with
the note crumpled up in it, just as the papers said."

"And you have no idea why it was there?"

"I didn't say that. I can guess. Fumes of ammonia are one of the
antidotes for poisoning of this kind."

"But Vera Lytton could hardly have known that," objected Kennedy.

"No, of course not. But she probably did know that ammonia is good
for just that sort of faintness which she must have experienced
after taking the powder. Perhaps she thought of sal volatile, I
don't know. But most people know that ammonia in some form is good
for faintness of this sort, even if they don't know anything about
cyanides and - "

"Then it was cyanide?" interrupted Craig.

"Yes," he replied slowly. It was evident that he was suffering
great physical and nervous anguish as the result of his too intimate
acquaintance with the poisons in question. " I will tell you
precisely how it was, Professor Kennedy. When I was called in to
see Miss Lytton I found her on the bed. I pried open her jaws and
smelled the sweetish odour of the cyanogen gas. I knew then what
she had taken, and at the moment she was dead. In the next room I
heard some one moaning. The maid said that it was Mrs. Boncour,
and that she was deathly sick. I ran into her room, and though she
was beside herself with pain I managed to control her, though she
struggled desperately against me. I was rushing her to the bathroom,