264 Penfield — Use of the Stereographic Projection for 



hemispheres covers the antipodal point on the other. In 

 order to accomplish this the poles are reversed, and one of the 

 hemispheres must be like a negative in photography. Thus, 



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in figure 14, the western hemisphere appears as we are accus- 

 tomed to seeing it, while the eastern hemisphere may be 

 made to appear right, as in figure 9, page 258, by turning 



