. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. 226 Biology of the Vertebrates hollow nipple. There is thus formed a secondary tube or elongation upward of the milk pocket itself, called the milk canal, into which the mammary glands pour their secretion, to be pumped to the tip of the false nipple. The mammary apparatus develops equally in both sexes up to the time of puberty, when it degenerates in the male and becomes potentially func- tional in the female. The male may produce milk, as in the primiti
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. 226 Biology of the Vertebrates hollow nipple. There is thus formed a secondary tube or elongation upward of the milk pocket itself, called the milk canal, into which the mammary glands pour their secretion, to be pumped to the tip of the false nipple. The mammary apparatus develops equally in both sexes up to the time of puberty, when it degenerates in the male and becomes potentially func- tional in the female. The male may produce milk, as in the primitive mono- treme Echidna, and also in exceptional instances among higher mammals, even in man. Such abnormal behavior is termed 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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