INDEX. 54? 



Pulex. See flea. 



O 



puadrupeds. Their fl:ru(fture, 63. The nmllarity of theif 

 ftru6ture and organs to thofe of man, 63. Of the carniv- 

 orous kinds, 66. Of the herbivorous, 67. Few quadru- 

 peds pair, 285. Undergo changes of form after birth, 293. 

 Their mental powers Ukewife change, ibid. Some of them 

 conftru(St habitations, 315. Of carnivorous quadrupeds, 

 382. Their difcriminating chara6ters, 468, 469. Some of 

 them migrate, 496. Of their longevity, 513. 



Quails. Of their migration, 477. 



R 



Rapacious. See carnivorous. 



Rats of Kamtfchatka. Fheir artifices and manners, 4-11. 



Ravens. Their mode of breaking ilieil-fifhesj 413. Their 

 longevity, 513. 



Razor-fifh. See fpout-fifh. 



Rein-deer, the chief food of the Laplanders, 221. 



Refpiration. Air neceffary to the exiftence of all animal and 

 vegetable bodies, 112. The mode in which refpiration is 

 carried on by man and the larger land animals, 112. Dr. 

 Crawford has rendered it probable that refpiration is the 

 caufe of animal heat, 113. Conne6led with the circulation 

 of the blood, 115. Commences inftantly after birth, and 

 continues during life, 116. Of laughing, 118. Of weep- 

 ing, ibid. Many fecondary advantages derived from ref- 

 piration, 119. Birds refpire by the bones, and almoft eve- 

 ry part of the body, as well as by the lungs, 121. Refpi- 

 ration of fiflies, 125. Refpiration of infe6ls, 126. 



Retina. Exte nal objecls painted on it in an inverted por- 

 tion, 187. Why objects are feen ere^t notwithftanding 

 the inverfion of the pidlures, 188, 189. Why vifion is 

 fmgle though a pi(!:lure is painted on each eye, 190, 191. 



Roebuck. His artifices and manners, 406. 



S 



Saliva, a powerful folvent, 173. 

 Salmons. Of their mijrrations, &c. 497. 

 Scale. Of the progrefllve fcale of beings, 521, &c. 

 Scallop. Its motions defcribed, 148. 



Scarabaei, or the beetle tribe of infedls, an account of them^ 

 98. 



