“For several thousand years man has been in contact with animals whose character and habits have been deformed by domestication. He has ended by believing that he understands them. All he means by this is that he is able to rely on certain reflex actions which he himself has implanted in them. He will flatter himself at times on the grasp of animal psychology which has brought him the love of the dog and the purr of the cat; and on the strength of such assumptions he approaches the beasts of the jungle. The old tag about nature being an open book is just not true. What nature offers on a first examination may appear to be simple but it is never as simple as it appears.”