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Source: Insectivorous Plants (1875), chapter III: "Aggregation of the Protoplasm within the Cells of the Tentacles",  page 40 http://darwin-online.org.uk/content/frameset?pageseq=55&itemID=F1217&viewtype=image
                                    
 
                             
                             
                             
                             
                             
                             
                             
                            