The basics for Isarithmic mapping is that the cartographer selects a distinctive color or shading, and applies it to artificial collection units (chorograms). Chorograms are statistical or administrative areas. It is these chorograms that are "colored or shaded",i.i. the symbology is applied so that the map reader can see within which symbol class the chorogram belongs.
http://www.d.umn.edu/geog/cartfolder/Scott%27s%20Images/isarithmic-ex-2.jpg
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