. Animal biology. Biology; Zoology; Physiology. 466 ANIMAL BIOLOGY reducible — gave content to the term biology and created the sci- ence of life in its modern form. (Fig. 9.) 5. Embryology The cell theory resulted, as we have seen, from combined studies on the adult structure and on the development of plants and ani- mals, and accordingly implies that the science of embryology has a history of its own. As a matter of fact, Aristotle discussed the wonder of the beating heart in the hen's egg after three days' in- cubation, but there the subject practically rested until Fabricius. Fig. 303. — T
. Animal biology. Biology; Zoology; Physiology. 466 ANIMAL BIOLOGY reducible — gave content to the term biology and created the sci- ence of life in its modern form. (Fig. 9.) 5. Embryology The cell theory resulted, as we have seen, from combined studies on the adult structure and on the development of plants and ani- mals, and accordingly implies that the science of embryology has a history of its own. As a matter of fact, Aristotle discussed the wonder of the beating heart in the hen's egg after three days' in- cubation, but there the subject practically rested until Fabricius. Fig. 303. — Theodor Schwann. (1537-1619) at Padua, early in the seventeenth century, published a treatise which illustrated the obvious sequence of events within the hen's egg to the time of hatching. This beginning was built upon by a pupil of Fabricius, the celebrated Harvey, who added many details of interest, though little progress in embryology was possible without the microscope. The microscope was first turned on embryological problems by the versatile Malpighi in two treatises published in 1672, and at one step animal development was placed upon a plane so ad- vanced that for over a century it was unappreciated. One conclu-. 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 Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company
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