Jules Verne

EIGHT HUNDRED LEAGUES ON THE AMAZON
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CHAPTER XIII

IS IT A MATTER OF FIGURES?

IT WAS SEVEN o’clock in the evening. Judge Jarriquez had all the time been absorbed in working at the puzzle—and was no further advanced—and had forgotten the time of repast and the time of repose, when there came a knock at his study door.

It was time. An hour later, and all the cerebral substance of the vexed magistrate would certainly have evaporated under the intense heat into which he had worked his head.

At the order to enter—which was given in an impatient tone—the door opened and Manoel presented himself.

The young doctor had left his friends on board the jangada at work on the indecipherable document, and had come to see Judge Jarriquez. He was anxious to know if he had been fortunate in his researches. He had come to ask if he had at length discovered the system on which the cryptogram had been written.

The magistrate was not sorry to see Manoel come in. He was in that state of excitement that solitude was exasperating to him. He wanted some one to speak to, some one as anxious to penetrate the mystery as he was. Manoel was just the man.

“Wir,” said Manoel as he entered, “one question! Have you succeeded better than we have?”

“Sit down first,” exclaimed Judge Jarriquez, who got up and began to pace the room. “Sit down. If we are both of us standing, you will walk one way and I shall walk the other, and the room will be too narrow to hold us.”

Manoel sat down and repeated his question.

“No! I have not had any success!” replied the magistrate; “I do not think I am any better off. I have got nothing to tell you; but I have found out a certainty.”

“What is that, sir?”

“That the document is not based on conventional signs, but on what is known in cryptology as a cipher, that is to say, on a number.”

“Well, sir,” answered Manoel, “cannot a document of that kind always be read?”

“Yes,” said Jarriquez, “if a letter is invariably represented by the same letter; if an a, for example, is always a p, and a p is always an x; if not, it cannot.”

“And in this document?”

“In this document the value of the letter changes with the arbitrarily selected cipher which necessitates it. So a b will in one place be represented by a k will later on become a z, later on an u or an n or an f, or any other letter.”

“And then?”

“And then, I am sorry to say, the cryptogram is indecipherable.”

“Indecipherable!” exclaimed Manoel. “No, sir; we shall end by finding the key of the document on which the man’s life depends.”

Manoel had risen, a prey to the excitement he could not control; the reply he had received was too hopeless, and he refused to accept it for good.

At a gesture from the judge, however, he sat down again, and in a calmer voice asked:

“And in the first place, sir, what makes you think that the basis of this document is a number, or, as you call it, a cipher?”

“Listen to me, young man,” replied the judge, “and you will be forced to give in to (...)

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