Insectivorous Plants is a book by British naturalist and evolutionary theory pioneer Charles Darwin, first published on 2 July 1875 in London.Part of a series of works by Darwin related to his theory of natural selection, the book is a study of carnivorous plants with specific attention paid to the adaptations that allow them to live in difficult conditions. It includes illustrations by Darwin himself, along with drawings by his sons George and Francis Darwin.
Detractors sometimes claim Darwin thought that the cell was an undifferentiated mass of protoplasm. Anyone reading the passage above will realize that Darwin thought no such thing.
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
