[Clinical and experimental researches about the expired CO2 origin (author's tranal)].

We are convinced on the basis of experiments made on animals and on the basis of observations made during pneumonectomies operations, that the expired CO2 does not originate only from the arterial pulmonary system. Our experineces prove that the expired CO2 originates in a not negligible quantity from the blood of the bronchial arteries and the metabolism of the lung.