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208 THE BRITISH MEDICAL 7OURNAL. ISePt. 7, 1867. throughout the mass of the blood, would lend stili more colour to these conjectures. Then, the great weight of the vapour, besides increasing the tendency to protraction of the narcotism from the difficulty of its exhalation, points to the probability of the collection of a residuum in the lungs to deepen the narcosis after inhalation has been suspended. This, to my mind, with great show of likelihood, explains the reason of the narrow line ofdoi:10.1136/bmj.2.349.208-a fatcat:ihksk5ckjbchpkngd6gexfgtve