Mémoires sur la respiration par Lazare Spallanzani, traduits en français, d'après son manuscrit inédit, par Jean Senebier.

Spallanzani's experimental data laid the groundwork for modern conceptions of respiratory physiology. In concluding that the blood transported carbon dioxide as a product of tissue oxidation, Spallanzani discovered parenchymatous respiration--usually accredited to the biochemist Liebig half a century later. Spallanzani demonstrated that the tissues consume oxygen and give off carbon dioxide.

Digital facsimile from Google Books at this link.