Abstract
The following observations were made from microscopic dissections of corrosion models of human lungs: 1. Distal to the alveolar duct of the primary lobule there are no further vessels which can be identified as subdivisions of the pulmonary artery, except the capillary network of the alveoli. 2. There are rich anastomoses between the vessels feeding the capillary network and between different sections of the network itself. 3. A capillary network is not necessarily confined to one alveolus, but continues on from one alveolus to another. 4. Alveoli adjacent to vessels proximal to the alveolar duct precapillary have their alveolar capillary networks formed directly from branches of these vessels. 5. The capillaries of the network measure less than 0.014 mm. in diameter which implies that every red blood cell passing through these capillaries has at least one side exposed directly to the alveolar surface.
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