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Table 1

Table 1

Related Figures (3)

Fig. 1. Karl Ernst von Baer’s segmenting development of frog eggs. From von Baer, “Die Metamophose des Eies der Batrachier vor der Erscheinung des Embryo,” Archiv fiir Anatomie, Physiologie und Wissenschaftliche Medizin (1834: pp. 481-509). Plate labeled as Table XI and bound at the back of the volume. Courtesy of the Marine Biological Laboratory Library.
Fig. 1. Karl Ernst von Baer’s segmenting development of frog eggs. From von Baer, “Die Metamophose des Eies der Batrachier vor der Erscheinung des Embryo,” Archiv fiir Anatomie, Physiologie und Wissenschaftliche Medizin (1834: pp. 481-509). Plate labeled as Table XI and bound at the back of the volume. Courtesy of the Marine Biological Laboratory Library.
Fig. 2. Frank Rattray Lillie’s freemartin, with one male and one female twin joined, as part of Lillie’s demonstration of the ways that the male dominates the female’s development. This is the original drawing, hanging in the Marine Biological Laboratory Archives and donated by Lillie. Still a different kind of pathology that may seem similar but actually is not concerns teratomas. The cases just described consist of two separate, and at some point independent, fertilized eggs that come together. In the case of teratomas the embryo is single, yet In other cases, two embryos come together and develop abnormally. In some cases, one twin dies and is absorbed by the other. Yet in other cases, the second twin is not absorbed; rather one continues to develop apparently normally, but with a devel- oping parasitic twin inside. Examples include an individual with the back of another individual growing out of it, or with part of a body curled up inside the living individual. All manner of possi- bilities seem to occur. Again, today in developed countries, surgery can correct what is seen as a medical problem, but cases still do
Fig. 2. Frank Rattray Lillie’s freemartin, with one male and one female twin joined, as part of Lillie’s demonstration of the ways that the male dominates the female’s development. This is the original drawing, hanging in the Marine Biological Laboratory Archives and donated by Lillie. Still a different kind of pathology that may seem similar but actually is not concerns teratomas. The cases just described consist of two separate, and at some point independent, fertilized eggs that come together. In the case of teratomas the embryo is single, yet In other cases, two embryos come together and develop abnormally. In some cases, one twin dies and is absorbed by the other. Yet in other cases, the second twin is not absorbed; rather one continues to develop apparently normally, but with a devel- oping parasitic twin inside. Examples include an individual with the back of another individual growing out of it, or with part of a body curled up inside the living individual. All manner of possi- bilities seem to occur. Again, today in developed countries, surgery can correct what is seen as a medical problem, but cases still do
Fig. 3. Beatrice Mintz and her chimeric mice. (Photo available through the Smithso- nian Institution, Acc. 90—105—Science Service Records, 1920s—1970s, Smithsonian Institution Archives, http://www.flickr.com/photos/smithsonian/6891505741 /.)
Fig. 3. Beatrice Mintz and her chimeric mice. (Photo available through the Smithso- nian Institution, Acc. 90—105—Science Service Records, 1920s—1970s, Smithsonian Institution Archives, http://www.flickr.com/photos/smithsonian/6891505741 /.)