The monkeys before they were transferred to this house suffered a great mortality, and indeed, on taking possession of their new apartment, the keepers used to remove the dead by the barrowful in the morning. This extreme mortality was produced by want of ventilation, and a system of heating which burnt the air and induced inflammation of the lungs. Dr. Marshall Hall and Dr. Arnott, upon being consulted, directed the substitution of an open stove, when the deaths ceased. As we pass towards the small building once used as the parrot-house, but now dedicated to the smaller felidæ, we go by the seal-pond, and see that strange beast which resembles a Danish carriage-dog with his legs amputated. He is an epicure as regards his regular meals, and turns up his nose at any fish less _recherché_ than whiting, of which expensive delicacy he consumes ten pounds weight daily. Meanwhile, however, he is "a snapper-up of unconsidered trifles," and we see him, as the visitors circulate round his enclosure, flop, flop, around the margin of his pond, keeping a sharp look-out above the railings for stray favours. The house of the smaller carnivora is generally overlooked, but it is worthy of a visit, if only to see the beautiful clouded tigers as they are misnamed, for they more resemble hunting leopards both in size and skin-markings. These elegant creatures are quite tame, and permit the utmost familiarities of their keeper; but their neighbour, the caracal or lynx, never seems tired of making the most ferocious rushes at the bars, accompanied by a vindictive and incessant spitting, which impresses us with the idea that it possesses the very quintessence of catlike nature. There is one little cage in this apartment which is deserving of especial inspection--that containing a specimen of the indigenous black rat, which, according to Mr. Waterton, was entirely eaten out of the country by the grey rats of Hanover, which came over in the same ship with _Dutch William_, and which are, according to that hearty naturalist, the very emblems of "Protestant rapacity." Those who have read his delightful essays know well with what perseverance the author hunts the grey rodent through every chapter of his book.