“Logically, the only case would be that where no one had been poisoned, that is to say, where no one had taken any poison.”
“But the presence of the poison has been established!” cried the Emperor.
“Still, the presence of the poison proves only its presence, not the crime. Both poison and ipecac were found in the stomach expulsions. From which a crime has been concluded. What state of affairs was necessary for there to have been no crime? Simply that the poison should have appeared in the expulsions after the ipecac. Then there would have been no poisoning, but everyone would believe there had been. And, for that, someone would have poured the poison into the expulsions.”
The Tsar never quitted Rouletabille’s eyes.
“That is extraordinary,” said he. “But of course it is possible. In any case, it is still only an hypothesis.
“And so long as it could be an hypothesis that no one thought of, it could be just that, Sire. But if I am here, it is because I have the proof that that hypothesis corresponds to the reality. That necessary proof of Natacha’s innocence, Your Majesty, I have found with the rope around my neck. Ah, I tell you it was time! What has hindered us hitherto, I do not say to realize, but even to think, of that hypothesis? Simply that we thought the illness of the general had commenced before the absorption of the ipecac, since Matrena Petrovna had been obliged to go for it to her medicine-closet after his illness commenced, in order to counteract the poison of which she also appeared to be the victim.
“But, if I acquire proof that Matrena Petrovna had the ipecac at hand before the sickness, my hypothesis of pretense at poisoning has irresistible force. Because, if it was not to use it before, why did she have it with her before? And if it was not that she wished to hide the fact that she had used it before, why did she wish to make believe that she went to find it afterwards?
“Then, in order to show Natacha’s innocence, here is what must be proved: that Matrena Petrovna had the ipecac on her, even when she went to look for it.”
“Young Rouletabille, I hardly breathe,” said the Tsar.
“Breathe, Sire. The proof is here. Matrena Petrovna necessarily had the ipecac on her, because after the sickness she had not the time for going to find it. Do you understand, Sire? Between the moment when she fled from the kiosk and when she returned there, she had not the actual time to go to her medicine-closet to find the ipecac.”