Just as in the case of plants which when divided are observed to continue to live though separated from one another (thus showing that in their case the soul of each individual plant was actually one, potentially many), so we notice a similar result in other varieties of soul, ie in insects which have been cut in two; each of the segments possesses both sensation and local movement; and if sensation, necessarily also imagination and appetition; for, where there is sensation, there is also pleasure and pain, and, where these, necessarily also desire.