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Parapsychologist Sir William Barrett , who investigated the photograph in 1895 , surmised that the " ghost " was a servant , but the late viscount 's daughter-in-law stated that the male servants in the house were all much younger in appearance and the outside servants were attending the funeral .
 William Barrett
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 William Barrett