MEASURING CO IN RESPIRED GASESPco2 are discussed. The most important practical conclusion is that the volume of gas in the bag should not be more than twice the tidal volume; but the exact ratio is not critical.Suitable equipment is described. Practical problems and variations in technique are described in detail.We are grateful to the many people who have told us of their experience and difficulties, and particularly to those who have suggested modifications and improvements. Dr.

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