. The young lady's library of useful and entertaining knowledge : intended as a holiday or birth-day present. are afterwards maturetl. ZOOLOGV. 29 i ack-bone (livideil into joints, termed vertebra:, containingilie spinal marrow, &c. 2. Animals not furnished with these vertebrae. The class of vertebrated animals is subdivided into suchas have warm blood, and a heart with two ventricles or<avities, and such as have blood comparatively cold, and aheart with but one ventricle ; the former subdivision com-prising quadrupeds and birds, and the latter amphibiousanimals and fishes. The class of inv
. The young lady's library of useful and entertaining knowledge : intended as a holiday or birth-day present. are afterwards maturetl. ZOOLOGV. 29 i ack-bone (livideil into joints, termed vertebra:, containingilie spinal marrow, &c. 2. Animals not furnished with these vertebrae. The class of vertebrated animals is subdivided into suchas have warm blood, and a heart with two ventricles or<avities, and such as have blood comparatively cold, and aheart with but one ventricle ; the former subdivision com-prising quadrupeds and birds, and the latter amphibiousanimals and fishes. The class of invertebrated animals issubdivided into such as have a system of vessels for thecirculation of the blood, comprising the molusca and Crus-tacea; and such as have not this system, comprisinginsects and zoophytes. Those of our young readers who wish to acquire a perfectknowledge of the structure of the various tribes of animalsinhabiting different parts of the Earth, cannot choose abetter path to the attainment of their object, than by atten-tively and perseveringly studj-ing Cuvier. 292 HASTINGS I HASTINGS CASTLE, SUSSEX. The origin of this castle, which is now in a very ruinouscondition, is unknown. That the castle is very ancient, iscertain from many circumstances, but the ig:norance ofits origin is by no means a satisfactory proof of itsantiquity. It is situated on a hill to the westward of thetown of Hastings. Its original figure seems to have beenan oblique spherical triangle, with the points rounded base of the triangle, or south side, is formed by a per-pendicular cliif, 400 feet in length, and fronts the sea; theeast side is a plain wall, without tower or other defence,300 feet long, and the wall which forms the remaining sideof the triangle, is about 400 feet long. The whole area HASTINGS CASTLE. 293 occupied by the castle is about an acre and a quarter inextent. The walls are in some places eight feet thick, butare nowhere entire, and the gateway, which w
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