. Quain's elements of anatomy . dingto Moleschott and others, there is likewise an intermixture of muscularfibre-cells. A number of granular rounded amoeboid cells are usually tobe found free in the air-cells and smaller bronchial tubes : not unfre-quently they contain carbonaceous particles. By the migration of thesecells into the pulmonary tissue, the carbon particles may be conveyedinto the substance of the lung and thence into the lymphatics and 518 THE LUNGS. broncliial glands, but fluids and fine particles can also, it is believed,penetrate directly to the lymphatics, both of the interal
. Quain's elements of anatomy . dingto Moleschott and others, there is likewise an intermixture of muscularfibre-cells. A number of granular rounded amoeboid cells are usually tobe found free in the air-cells and smaller bronchial tubes : not unfre-quently they contain carbonaceous particles. By the migration of thesecells into the pulmonary tissue, the carbon particles may be conveyedinto the substance of the lung and thence into the lymphatics and 518 THE LUNGS. broncliial glands, but fluids and fine particles can also, it is believed,penetrate directly to the lymphatics, both of the interalveolar tissue andof the bronchial tubes, by aid of the pseudostomata which connect thecell-spaces of the connective tissue with the inner surface of the mucousmembrane (see p. 521). The air-cells in the natural state, are always filled with air. They are readilyseen on the surface and in a section of a lung, which has been inflated with airand dried; also upon portions of foetal or adult lung injected svith mercury or Fig. Fig. 448.—PouTioN OF the outer stjrpace op the cows LUNG (from Kolhkerafter Harting). Magnified 30 diameters. a, pulmonary vesicles filled artificially with was; h, the margins of the smallestlobules or infundibula. was (fig. 448, a, a). In the lungs of some animals, as of the lion, cat, anddog, they are very large, and are distinctly visible on the surface of theorgan. In the adult human lung their most common diameter is about j^thof an inch (025 mm.), but it varies from j^gth to ^^^th of an inch ; they arelarger on the sucface than in the interior, and largest towards the thin edgesof the organ : they are also very large at the apes of the lung. Their dimensionsgo on increasing from birth to old age, and they are larger in men than in the infant the diameter is usually under :7^th of an inch. The whole lung has a lobalated structure best seen in the foetus, where thelungs, not yet distended with air, present very much the ai^pearance of co
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