INDEX. 297 



Jack-daw, its description, iv. 183. Rings found in the nest of 

 a tame jack-daw, 176- 



Jacobines, a kind of pigeons, iv. 240. 



Jaculus, the swiftest serpent, its manner of progression by 

 coiling, v. 342. 



Jaguar, or the panther of America, if. 4-30. 



Japanese, description of that people, ii. 81. 



Jaw, the upper, thought by many quite immoveable ; that it 

 moves in man an easy experiment will evince ; has its pro- 

 per muscles behind the head for thus raising and depressing 

 it ; under jaw in the embryo much advanced before the 

 upper, in the adult it hangs more backward ; and in a Chi- 

 nese face it falls still more backward than with us ; the dif- 

 ference is thought half an inch, the mouth being shut 

 naturally ; a professor at Edinburgh was subject to have his 

 jaw dislocated ; the under jaw has often an involuntary 

 quivering motion, and often a state of languor produces 

 another, that of yawning, a very sympathetic kind of lan- 

 guid motion ; ridiculous instance of this sympathetic affec- 

 tion commonly practised upon the famous M'Latirin, i. 419. 



Jay, one of the most beautiful of the British birds : its des- 

 cription ; feeds upon fruits, kills small birds, and is ex- 

 tremely docile, iv. 192. Lays its eggs in the holes desert- 

 ed by the woodpecker, 200. 



Ibex, a native of the Alps, the Pyrenees, and the mountains 

 of Greece : its description, ii. 273. 



Ibis, the Egyptians paid divine honours to this bird ; different 

 opinions concerning the ancient and modern ibis ; Maillet's 

 observations to this purpose ; the true ibis thought a bird 

 of the vulture kind, called by some the capon of Pharaoh, 

 iv. 308. The true ibis found to be the Balearic crane ; 

 described, 310. 



Ice very elastic, i. 155. Floats of it diffused into plains of 

 above two hundred leagues in length ; and mountains of 

 it rising amidst them ; flat ice, and mountain ice ; their 

 formation ; mountains of it presenting the resemblance of a 

 glory, 209. 



Ichneumon, by some injudiciously denominated the cat of 

 Pharaoh, one of the boldest and most useful animals of the 

 weasel kind ; used in Egypt for the same purposes as cats 

 in Europe ; description ; discovers and destroys the effgs 

 of the crocodile ; serpents its most natural food ; grows 

 fast and dies soon ; easily strangles a cat stronger and lar- 

 ger than itself; countries where found ; attacks every living 

 thing it is able to overcome, and fears not the force" of the 

 dog, nor the claws of the vulture ; takes the water like an 

 otter, and will continue under much longer ; not able to 

 support the rigour of our winters ; one from the island of 

 Ceylon climbed up the walls and the trees with very great 



