In every instance the loss of vitality–that is, the loss of the normal power to convert potential into kinetic energy– was accompanied by physical changes in the brain-cells (Figs. 45 and 46). The converse was also true, that is, the brain-cells of animals with normal vital power showed no histologic changes. The changes in the brain-cells were identical whatever the cause. The crucial question then becomes: Are these constant changes in the brain-cells the result of work done by the brain-cells in running,dj headphones, in fighting,custom usb, in emotion,usb flash drive, in fever? In other words, does the brain perform a definite role in the conversion of latent energy into fever or into muscular action; or are the brain-cell changes caused by the chemical products of metabolism? Happily, this crucial question was definitely answered by the following experiment: The circulations of two dogs were crossed in such a manner that the circulation of the head of one dog was anastomosed with the circulation of the body of another dog, and vice versa. A cord encircled the neck of each so firmly that the anastomosing circulation was blocked (Fig. 58). If the brain-cell changes were due to metabolic products, then when the body of dog “A” was injured, the brain of dog “A” would be normal and the brain of dog “B” would show changes. Our experiments showed brain-cell changes in the brain of the dog injured and no changes in the brain of the uninjured dog.

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“Sauvresy had enjoined on me to give it only into her hands.”

“Oh, he knew how to work his revenge. He had it given to his wife so that she might hold a terrible arm against Tremorel, all ready to crush him. If he revolted, she always had this instrument of torture at hand. Ah,custom usb, the man was a miserable wretch, and she must have made him suffer terribly.”

“Yes,” said Dr. Gendron, “up to the very day he killed her.”

The detective had resumed his promenade up and down the library.

“The question as to the poison,” said he, ” remains. It is a simple one to resolve, because we’ve got the man who sold it to her in that closet.”

Besides,” returned the doctor,” I can tell something about the poison. This rascal of a Robelot stole it from my laboratory, and I know only too well what it is, even if the symptoms, so well described by our friend Plantat, had not indicated its name to me. I was at work upon aconite when Sauvresy died; and he was poisoned with aconitine.”

“Ah, with aconitine,” said M. Lecoq, surprised. “It’s the first time that I ever met with that poison. Is it a new thing?”

“Not exactly. Medea is said to have extracted her deadliest poisons from aconite, and it was employed in Rome and Greece in criminal executions.”

“And I did not know of it! But I have very little time to study. Besides, this poison of Medea’s was perhaps lost,custom usb drives, as was that of the Borgias; so many of these things are!”

“No, it was not lost, be assured. But we only know of it nowadays by Mathiole’s experiments on felons sentenced to death, in the sixteenth century; by Hers, who isolated the active principle, the alkaloid, in 1833 and lastly by certain experiments made by Bouchardat, who pretends – ”

Unfortunately, when Dr. Gendron was set agoing on poisons,cheap headphones, it was difficult to stop him; but M. Lecoq, on the other hand, never lost sight of the end he had in view.

“Pardon me for interrupting you, Doctor,” said he. “But would traces of aconitine be found in a body which had been two years buried? For Monsieur Domini is going to order the exhumation of Sauvresy.”

“The tests of aconitine are not sufficiently well known to permit of the isolation of it in a body. Bouchardat tried ioduret of potassium, but his experiment was not successful.”

“The deuce!”