INDEX. 275 



SO. In Greenland do not change colour at all, 74. Taken 

 young, are gentle only while cubs ; growing older, discover 

 their natural appetites of rapine and cruelty, 7. Nothing 

 eatable comes amiss to them, rats, mice, serpents, toads, 

 and lizards ; insects, crabs, shrimps, and shell-fish ; carrots, 

 wax, and honey ; even the hedge-hog, 4-8. Chase of the 

 fox; their offensive smell often the cause of their death; 

 way they find to subsist ; name given by huntsmen to a fox 

 of the second year ; old fox the name for the third year, 49. 

 Many animals in this country bred between a dog and a 

 fox; experiments prove neither the wolf nor the fox of the 

 same nature with the dog, each a species perfectly distinct, 

 25. Exactly resembles the wolf and the dog internally, 

 45. Description; eyes obliquely situated, like the wolf, 

 ib. Often takes possession of the hole quitted by the 

 badger, or forces it from its retreat by art, 392. 



Fox, (crost) name of the isatis, when turning white, iii. 60. 



Fox-tailed monkey, of the sagoin kind, iii. 319. 



Fray, said when stags rub off the peel of their horns against 

 trees, ii. 317. 



Frog, designedly introduced into Ireland before the Norway 

 rat ; the rat put a stop to their increase, and the frog is 

 almost extinct in that kingdom, iii. 176. Differences be- 

 tween it and the toad in figure and conformation, v. 255. 

 The frog the best swimmer of all four-footed animals ; its 

 description ; how the female brings forth eggs, various 

 changes in the eggs, after impregnation by the male ; the 

 animal in its perfect state, from feeding upon vegetables, 

 becomes carnivorous, lives upon worms and insects, and 

 seeks for food upon land ; myriads seen on such occasions, 

 have been fancied to be generated in the clouds, and show- 

 ered down on earth; their habitudes and food; difference 

 of sexes not perceivable until their fourth year ; do not 

 begin to propagate till that period ; live about twelve 

 years ; a German surgeon kept one eight years in a glass 

 covered with a net ; fed it often, but sparingly ; instances 

 of tenaciousness of life; the male only croaks; large water- 

 frog's note as loud as the bellowing of a bull, and heard 

 at three miles distance ; times of their croaking ; no wea- 

 ther-glass so true in foretelling changes ; adhere to the backs 

 of fishes ; story of Walton to this purpose ; dry weather 

 hurtful to frogs, v. 256. See Fishing-frog. 



Frost-smoke, fogs near the pole form halos, or luminous 

 circles, i. 328. 



Froth-worm, its description, vi. 37.. 



Fur, the colder the country the larger and warmer the fur ; 

 instances of it, ii. 166. Of the white fox not esteemed, and 

 why, iii. 53. The isatis of no value, unless killed in winter, 

 60. The ermine the most valuable of any, 72. No easy 



