IN NATURE of January 7 Mr. F. C. Constable describes an observation of the moral superiority of the blue-tit over the robin. This is by no means exceptional. I constantly observe the same thing from my dining-room window, where I have a string stretched across with pieces of cocoa-nut and pork-fat attached to it for the tits to feed upon. In the cold weather the robins come too, but they are never allowed to feed in company with the blue-tits; they are attacked at once if they venture to hold their ground. The long-tailed tits and the cole-tits are much less aggressive, and will even give way to the robins.