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13To avoid this the following method may be adopted; a lighted lamp must be lowered; if it continue to burn, a man may safely descend, but if the strength of the vapour extinguish it, then to the right and left of the well let air holes be dug, so that as it were through nostrils, the vapour may pass off. When this is done and we come to water, the well must be lined with a wall, but in such a manner as not to shut out the springs.
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