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 ![Pig Embryo](/sites/g/files/omnuum6316/files/chsi/files/pig_embryo.png)

 

**Transverse Section of Pig Embryo**  
  
**This drawing is an idealized reconstruction basedon hundreds of individual sections, microscope observations, a variety of measurements, and careful observation of a wax model. It was meant to give students a better understanding of the development of an embryo than they could get from an image of any individual example. Harvard Medical School illustrator, Florence Byrnes, worked with a medical school instructor, Frederic T. Lewis, to create this image for professor Charles Sedgwick Minot’s 1903 Laboratory Textbook of Embryology.**  
  
 **Florence Byrnes  
1903  
Courtesy of Warren Anatomical Museum, Center for the History of Medicine, Francis A. Countway Library of Medicine, Harvard University**