532 INDEX. 



Docility of animals, 435, &c. 



Dog. His fenfe of fmelling extremely acute, 164. Wild dogs hunt in packs, 433. 

 Next to the elephant, the dog is the mod docile animal, 450. Accommodates his 

 behaviour to the manners of thofe who command him, 451. Great differences in 

 their natural difpofitions, ibid. Condudl blind perfons with great fagacity, 452. An 

 extraordinary inftance of their intelligence, 453. The influence of climate upoa 

 them, 462. Fattened in China for the table, 471. 



Domeftication. Its effefts on different animals, 460. 



Dragon-fly. See libella. 



Dromedary. See camel. 



E 



Eagles. Their longevity, 513. 



Ears. See hearing and fenfes. Mufical ear a gift of Nature, 171. 



Earth, though fpacious, is comparatively fmall, 135. 



Education much influenced by the principle of imitation, 470. 



Eggs. Analogies between them and the feeds of plants, 35. Egg of the fpider-fly as 

 large as the mother, 296. Eggs of fome infefts grow after they are laid, 297. Se- 

 veral worms difcovered in the fame egg, 298. Eggs of bees impregnated after they 

 are depofited in the cells, 344. 



Elephant. His flruflure, 67. His fagacity and manners, 69. A more particular ac- 

 count of this animal, 441. &c. A mild and obedient domeftic, 444. Elephants 

 were formerly employed in war, 445. Their fenfe of fmelling very acute, 447. Re- 

 vengeful when affronted, 448. They are fenfible of good fortune, and maintain a 

 gravity of demeanour correfponding to the dignity of their fitualion, 449. They al- 

 low themfelves to be commanded by a child, ibid. More eafily tamed by mildnefs 

 than by blows, 450. 



Ephemeron-fly lives only one day in its perfeft ftate, but continues three years in the 

 water before its transformation, 90, 516. The nymphs refpire by gills, 123, 124. 



Evils neceffary in this world, 525. ' 



Expiration. See relpiration. 



Eyes. No animal, except the infedl tribes, has more than two, 84. Defcription of the 

 eye, 178. Inverted pidlures on the retina, 180. Why feen ftraight, 181, 182. 

 Why we fee fingle with two eyes, 183. Vifion conveys no idea of diftance, 184. 

 Why near objects appear large, and diftant ones fmall, 185. Origin of ghofts, &c. 

 185. 



