Why Was Galvani Placed on the Magnetism Branch of the 1932 Physics Map?

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This is an interesting visualization of the historical outline of physics (as of 1932). Enjoy.

http://scimaps.org/maps/map/being_a_map_of_physi_171/detail
 
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Why did they put Galvani on the magnetism branch of the electromagnetic river? He should be on the electricity branch, up stream of Volta.
 
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