. A manual of zoology. Zoology. GENERAL ORGANOLOGY 93 oxygen necessary to life, these organs have a double function, l)eing, at the same time, excretory organs for taking up food. I. The Digestive Tract. Archenteron or Primitive Digestive Tract.—Since the taking in of food and its assimilation are functions most important for the well- being of the animal, it is to be expected that of all the organs the digestive tract should be formed first. The fact that many worms (cestodes) and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for r
. A manual of zoology. Zoology. GENERAL ORGANOLOGY 93 oxygen necessary to life, these organs have a double function, l)eing, at the same time, excretory organs for taking up food. I. The Digestive Tract. Archenteron or Primitive Digestive Tract.—Since the taking in of food and its assimilation are functions most important for the well- being of the animal, it is to be expected that of all the organs the digestive tract should be formed first. The fact that many worms (cestodes) and. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
