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| 1909 || || Endotracheal anesthesia is introduced by Samuel James Meltzer and John Auer.<ref name="A Dictionary of the History of Medicine"/> ||
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| 1914 || Literature || "the The ''American Journal of Surgery, in 1914, began '' begins publication of the ''Quarterly Supplement of Anesthesia and Analgesia'', which endured would endure until 1926."<ref name="The History of Professionalism in Anesthesiology"/> ||{{w|United States}}
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| 1914 || || "Dr. Dennis E. Jackson develops a carbon dioxide (CO2) absorbing anesthesia system, allowing for a patient to re-breathe their exhaled air containing the anesthetic, cleansed of the carbon dioxide, resulting in the use of less anesthetic and the avoidance of waste. Ten years later, Dr. Ralph Waters develops the first simple and easily transportable absorber, known as the "Waters Canister" and the "Waters To-and-Fro.""<ref name="History of Anesthesia"/> ||
