A correspondent having read our recent article on Bird-affection, kindly sends us the following singular instance of intelligence and affection on the part of a duck. 'We have,' he tells us, 'two white ducks; the one designated Mr Yellowbill being wonderfully intelligent, yet fond of fun. My little son and he have great games together. The lad throws out an india-rubber ball a longer or shorter distance, leaving it for the bird to decide whether it shall be pursued with a flying or a running movement. In either case, the ball is swiftly seized by duckie, and returned to the thrower, who keeps up the game until both have had enough of it. Another peculiarity of Mr Yellowbill may be mentioned. At the splashing of water from an adjacent well he is aroused, and will instantly fly towards the scene of action, plunge in, bathe, jump out, flap his wings joyfully, and "like a bird," take himself off again. But the story of affection for his kind must now be told. The other day, when swinging on a gate, my little boy felt something tugging at his trousers, and on looking round discovered the duck, who, he supposed, invited him to a game at ball. So down he got, and caressed his feathered friend as the preliminary. The duck, however, continued pulling away in so unusual and persistent a manner that the lad decided to go whither he was led; and lo! at the corner of an outbuilding was found poor Mrs Yellowbill, lame of a leg and quite unable to waddle along. Meanwhile her husband continued to manifest the greatest concern about her, yet did not forget his manners and grateful acknowledgments, but bowed and better bowed to those around who had now come to the rescue; shewing that even a duck may act and feel as a gentleman. The cause of hurt referred to has not been ascertained; but happily Mrs Yellowbill is now quite well, and her husband is as lively as ever.'