INDEX. 



Savours, mechanical manner of accounting for difference of 

 savours, ii. 4-9. 



Scallop, in its shell, moves forward upon land, and swims 

 upon the surface of the water, in a singular manner, v. 239. 



Scaup-duck, a variety of the duck kind, iv. 420. 



Sciaena, a spinous fish; description, v. 121. 



Scolopendra, the centipedes, a hideous angry worm, des- 

 cribed, v. 434. 



Scomber, the mackerel, a prickly-finned thoracic fish ; its des- 

 cription, v. 120. 



Scooper. See Avosetta, iv. 337. 



Scorpaena, or father -lasher, of the prickly-finned thoracic kind; 

 description of this fish, v. 121. 



Scorpion, four principal parts distinguishable in this animal ; 

 the reservoir where its poison is kept ; effects of its sting 

 upon a dog, in an experiment made by M. Maupertuis ; 

 experiments made upon other dogs ; instances of its irasci- 

 ble nature and malignity ; when driven to extremity, des- 

 troys itself; instance of it; the male smaller than the fe- 

 male ; their chief food ; how the common scorpion pro- 

 duces its young ; captivity makes it destroy its young ; a 

 scorpion of America produced from the egg, v. 426. 



Scorpion, (water) an insect with wings, described ; its habits, 

 vi. 38. 



Scoter, an European duck, iv. 420. 



Screech-owl described, iv. 116. 



Sea, motion keeps its water sweet, i. 206. Open to all nations 

 till the time of the emperor Justinian, 201. Sensibly re- 

 tired in many parts of the coast of France, England, Hol- 

 land, Germany, and Prussia, 236. Norwegian sea has 

 formed several islands from the main land, and still advances 

 upon the continent, 239. Its colour not from any thing 

 floating in it, but from the different reflections of the rays 

 of light ; a proof of it ; though its surface be deformed by 

 tempests, it is usually calm and temperate below ; the sea 

 grows colder in proportion as divers descend, 250. Smokes 

 like an oven near the poles, when the winter begins, 328. 

 No fish imbibe any of the sea saltness with food, or in res- 

 piration; why some species live only there, and expire 

 when brought into fresh water, v. 131. 



Sea-bream, an account of, v. 120. 



Sea-eggs, name given to the multivalve shell-fish ; of the 

 echini, or urchins, which move, v. 247. 



Sea-lion described, iii. 270. 



Sea-nettles, name given by some to the star-fish, vi. 182. 



Sea-water, various methods proposed to render it fresh for the 

 use of seamen in long voyages, i. 205. About a forty-fifth 

 part heavier than fresh water ; is heavier, and consequently 

 salter, the nearer we approach the line, 208. See Salt-water. 



