. The structure and life of birds. Birds; Evolution. 8o THE STRUCTURE AND LIFE OF BIRDS CHAP. more work, in proportion to the size of his body, out of his exceedingly small and light lungs than a man can out of his far heavier apparatus. Any one who ICS. Fig. 23—Diagram after Heider. Air-sacks excepting the cervical, Tlie lungs are shaded dark. Abs, abdominal sack ; as, anterior thoracic ; b, entrance of bronchial membrane ; h, humerus; ics, interclavicular sack, surrounding trachea; and i, z, 3, 4, its extensions; 2 opens between the pectoral muscles; ps, posterior thoracic sack ; t, trachea.
. The structure and life of birds. Birds; Evolution. 8o THE STRUCTURE AND LIFE OF BIRDS CHAP. more work, in proportion to the size of his body, out of his exceedingly small and light lungs than a man can out of his far heavier apparatus. Any one who ICS. Fig. 23—Diagram after Heider. Air-sacks excepting the cervical, Tlie lungs are shaded dark. Abs, abdominal sack ; as, anterior thoracic ; b, entrance of bronchial membrane ; h, humerus; ics, interclavicular sack, surrounding trachea; and i, z, 3, 4, its extensions; 2 opens between the pectoral muscles; ps, posterior thoracic sack ; t, trachea. See r ig. 25. wishes to see the air-sacks—and to see them is much better than only to read of them—should take some bird of moderate size, such as a pigeon, cut through the windpipe somewhere in the neck, insert a blowing-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Headley, F. W. (Frederick Webb), 1856-1919. London, New York, Macmillan
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1895
