INDEX 



A 



A(flinia. See fea-nettle. 



Air, neceffary to the exigence of all animals and vegeta- 

 bles, 1 12. Air-cells in birds defcribed, 119. Temporary 

 inftruments fometimes provided for its admiffion into ani-- 

 mal bodies, 130. Some animals can live long Vv'ithout it 

 135, 136. Air is always impregnated with odorous parti- 

 cles, 171. The medium of founds, 175. 

 Amphibious animals. See animals. Sketch of their ftruc- 

 ture and difpofitions, 75. The foramen ovale of their 

 hearts continue open during life, 76. 

 Analogy. See animals and plants. Analogy between birds 

 and fiflies, 126. Sexes of plants founded on falfe analo- 

 gies, 952. See fexes. 

 Animal heat. An attempt to account for it, 113. 

 Animacules. Thofe obtained by infunons multiply by con- 

 tinued divilions and fubdivifions, 42. 

 Animals. Difficulty of diftinguifhing them from plants, li. 

 See plants. All of them endowed with fenfation, 20. A 

 fketch of their ftrudlure and organs, 23. Analogies be- 

 tween animals and plants, originating from their ftru6ture 

 and organs, ibid. From their growth and nourifliment, 32, 

 39. The food of animals compared with that of plants, 36. 

 Analogies from their diflemination and decay, 40, &c. 

 Some animals neither viviparous nor oviparous, 41. Some 

 are both, ibid ; and fome multiply without impre^^na- 

 tion, 44. Analogies between the eggs of animals and 

 the feeds of plants, 46. Moft animals have their ieafons, 

 48, 288. All animals fubjefl to difeafes and death, 51. 

 Of the organs and general ftru^iure of animals, 54. Struc- 

 ture of man, ibid. Of the bones, ibid. Of the mufcular 

 parts, 56. Of the lungs, ibid. Of the ftomach and in- 

 ftruments of digeftion, 57. Of the organs of generation, 

 59. Of the brain and nerves, 61. Of the ftru(!^ure of 

 quadrupeds, 63. The general flru61:ure of c|uadrupeds has 



