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1 From the Department of Physiology, King's College, London
1. It has been shown that the isolated bronchial muscle of guinea pigs is sensitive to changes as low as 1 mgm. per cent in ionic concentration of calcium as measured by the response to histamine.
2. A seasonal variation in the response to histamine in guinea pigs has been noted.
3. The significance of these factors is discussed.
Submitted on December 24, 1931