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THE PHYSIOLOGY OF YOGAM
putting an India-rubber bag, or some such apparatus, over his nose and mouth, and making him breathe the same used up and carbonic acid-laden air again and again, allowing him a breath of fresh air from time to time if he becomes very livid. I am doubtful on second thoughts whether this applies to Yogam, though there is not much difference between restraining breath and breathing it again and again; for in the Yogi lividity does not occur, though that may again be accounted for by his having reduced his expenditure of energy and established cutaneous respiration,
Hatta Yogam is said to strengthen the lungs and to cause great muscular development and power of endurance. I have met men whe affirm that they have overcome chronic disease by practising it.
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