through written reports submitted to the Journal des sçavans, which enabled him to start a correspondence with Henry Oldenburg, and consequently the Philosophical Transaction. The transfusionist, although, omitted to credit the works done by English scientists, leading to many conflicts. He knew that the next step was that of initiating a radical new procedure between humans and animals, utilizing as a prime example the lamb, the symbol of the blood of Christ, hence the purest form. Human Attempts Denys administered the first full documented xenotransfusion on June 15, 1667. With the assistance of Paul Emmerez he transfused about twelve ounces of lamb blood into the veins of a 15-year-old boy who had suffered from uncontrollable fevers for two months and had been consequently bled with leeches 20 times by a barber-surgeon, to no effect. After Denys’ intervention, allegedly, by the next morning, the kid was alert, and seemingly cured of his illness. The physician, always with Emmerez by his side, performed another transfusion on a middle-aged man, a butcher, with pleasing results. The man had not died but rather was found to be in great spirit, although probably a consequence of the fact that the man later in the day went to the local tavern. Realistically, both instances of success were most likely due to the small amount of blood that was actually transfused into these people, which did not trigger any major allergic reaction. Antoine Mauroy It is uncertain where initial interest for Antoine Mauroy, the infamous madman of Paris derived from, it is known that it happened after Denis started working with Montmor, probably as a consequence of the competition happening with both the king's nascent Academy of Sciences and traditionalist Faculty of Medicine. Sometime in November 1667, Mauroy was abducted from the streets of Paris by Montmor's guard and tied to a chair and transfused with blood in front of an audience of noblemen. In the hours following the procedure, Mauroy experienced a debilitating fever, nausea, diarrhea, nosebleeds, and urine that was as black as ‘chimney soot’, fever, tachycardia, and abundant sweating. Just days later, the man had apparently fully recovered. This was the final proof for Denys, who right after publicizing his success, firstly by writing to Oldenburg, who published the letters received on the February 10, 1668 edition of the Philosophical Transactions (original and translated). Mauroy and his wife eventually returned to their modest home,