Henry III. was the proud possessor of a polar bear, which used to be taken for a swim in the Thames to disport itself and to catch fish, no doubt to the great joy of the young Londoners. This was a present from the King of Norway, and gifts of strange beasts were often made to our kings, the favourites naturally being lions and leopards, in allusion to the royal arms, the Black Prince on one occasion sending his father a lion and a leopard. In passing it may be remarked that it is a curious trait of the heraldic lion that it cannot look a man in the face; when a lion looks at you it becomes a leopard. This, I admit, sounds rather like the schoolboy's description of the tortuous river of Palestine, 'The Jordan runs straight down the middle of the map, but when you look at it it wriggles,'--but it is none the less a fact. In early heraldry the lean and fearsome beast that does duty for a lion when seen in profile is called a leopard when its full face is shown; it is true that a later generation of heraldic writers converted the three golden leopards of England into 'lions passant guardant,' but leopards they were, and, for those of us who prefer the heraldry of the classic period to its debased and jargonised descendant, leopards they remain. At the same time, as the live lions could hardly be expected to look continuously over their left shoulders, the royal menagerie at the tower was usually stocked with real leopards as well as lions. For generations, and indeed centuries, the lions of the Tower enjoyed much the same privileged position as the eponymous bears of Berne, and were so emphatically the sight to which all country cousins, by a humane version of 'Christianos ad leones,' had to be taken that their name became, and remains, synonymous with all that is double-asterisked by Baedeker. [Illustration: '_When a lion looks at you it becomes a leopard._']