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The history of the Institute , from its founding as the Physical Society of London in 1874 through to today 's Institute has meant that the name of the post held has varied .
 organization: Physical Society of London
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Physical Society of London