“During subsequent years, whenever I had leisure, I pursued my experiments, and my book on ‘Insectivorous Plants’ was published in July 1875—that is, sixteen years after my first observations. The delay in this case, as with all my other books, has been a great advantage to me; for a man after a long interval can criticise his own work, almost as well as if it were that of another person. The fact that a plant should secrete, when properly excited, a fluid containing an acid and ferment, closely analogous to the digestive fluid of an animal, was certainly a remarkable discovery.” — from The Autobiography of Charles Darwin
