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Charles Darwin described in Fertilisation of Orchids how he " touched the antennæ of C. callosum whilst holding the flower at about a yard 's distance from the window , and the pollinium hit the pane of glass , and adhered to the smooth vertical surface by its adhesive disc . "
 Charles Darwin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Charles Darwin