1. Pressures have been measured in the thoracic duct of anaesthetized and conscious dogs to ascertain the mean pressures, the nature of the pressure waves and the pressure gradients along the duct and between it and the great veins.2. The average mean pressure in the thoracic duct of ten anaesthetized dogs was 1·4 mm Hg. The pressure waves were secondary to respiration and the pulsations of the aorta. No waves were transmitted from the great veins.3. Pressures in conscious dogs varied from day to day, sometimes being positive, sometimes negative. They were increased by panting and by drinking.4. The pressure gradients along the duct were small, no more than 0·5-2·0 mm Hg along its whole length.5. No evidence was found of spontaneous contractions of the duct.
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机译：1.在麻醉和有意识的狗的胸导管中测量压力，以确定平均压力，压力波的性质以及沿着导管以及导管与大静脉之间的压力梯度。2。十只麻醉狗的胸导管平均压力为1·4 mm Hg。压力波是继发于呼吸和主动脉搏动的。大静脉没有波传播。3。有意识的狗的压力每天都在变化，有时是正压，有时是负压。通过喘气和喝酒使它们增加。4。沿导管的压力梯度很小，沿导管的整个长度不超过0·5-2·0 mmHg。5。没有发现导管自发收缩的证据。
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