* "It so chanced that, not long after the accession of the house of Hanover, some of the brown, that is, the German or Norway, rats, were first brought over to this country (in some timber as is said); and being much stronger than the black, or, till then, the common, rats, they in many places quite extirpated the latter. The word (both the noun and the verb to rat) was first, as we have seen, leveled at the converts to the government of George the First, but has by degrees obtained a wider meaning, and come to be applied to any sudden and mercenary change in politics." Lord Mahon.

Bamboo rat (Zoöl.), any Indian rodent of the genus Rhizomys. -- Beaver rat, Coast rat. (Zoöl.) See under Beaver, and Coast. -- Blind rat (Zoöl.), the mole rat. -- Cotton rat (Zoöl.), a long-haired rat (Sigmodon hispidus), native of the Southern United States and Mexico. It makes its nest of cotton and is often injurious to the crop. -- Ground rat. See Ground Pig, under Ground. -- Hedgehog rat. See under Hedgehog. -- Kangaroo rat (Zoöl.), the potoroo. -- Norway rat (Zoöl.), the common brown rat. See Rat. -- Pouched rat. (Zoöl.) (a) See Pocket Gopher, under Pocket. (b) Any African rodent of the genus Cricetomys. -- Rat Indians (Ethnol.), a tribe of Indians dwelling near Fort Ukon, Alaska. They belong to the Athabascan stock. -- Rat mole. (Zoöl.) See Mole rat, under Mole. -- Rat pit, an inclosed space into which rats are put to be killed by a dog for sport. -- Rat snake (Zoöl.), a large colubrine snake (Ptyas mucosus) very common in India and Ceylon. It enters dwellings, and destroys rats, chickens, etc. -- Spiny rat (Zoöl.), any South American rodent of the genus Echinomys. -- To smell a rat. See under Smell. -- Wood rat (Zoöl.), any American rat of the genus Neotoma, especially N. Floridana, common in the Southern United States. Its feet and belly are white.

Coleridge . . . incurred the reproach of having ratted, solely by his inability to follow the friends of his early days. De Quincey.