54J INDEX, 



Polypus. Defcription of its ftrufture and mode of multiplying, 17. When cut to pJecw 

 in any direftion, each feilion foon becomes a perfeil animal, 1 8. One fpecies ma/ 

 be engrafted upon another, ibid. Some polypi multiply by fplittfng longitudinally, 

 and others tranfverfely, 30, 31. Connects the animal to the vegetable fcingdoni, 



Probofcis of infects defcribed, 88. 



Propolis, or bee-glue. See bees. 



puberty. This period of life arrives later, or more early, according to the difference 

 of fpecies, 27. Of the puberty of animals in general, 264. Changes produced by 

 it, ibid. 265, 287. Females arrive fooner at that period than males, 266. All ani- 

 mals undergo changes at the age of puberty, 267. 



Puctrons. Some fpecies are both viviparous and oviparous, 33. Can produce without 

 impregnation, 34, 92. Differences between the males and females, 241. Devoured 

 by numberlefs enemies, 386. 



Pulex. See flea. 



Quadrupeds. Their ftrufture, 53. The fimilarity of their ftrufhire and organs to 

 thofe of man, 54. Of the carnivorous kinds, 57. Of the herbivorous, 58. Few 

 quadrupeds pair, 280. Undergo changes of form after birth, 288. Their mental 

 powers likewife change, ibid. Some of them conftruft habitations, 311. Of carni- 

 vorous quadrupeds, 378. Their difcriminating charadlers, 466, 467. Some of them 

 migrate, 494. Of their longevity, 511. 



Quails. Of their migration, 474. 



R 



Rapacious. See carnivorous. 



Rats of Kamtfchatka. Their artifices and manners, 407. 



Ravens. Their mode of breaking fhell-fifhes, 409. Their longevity, j 12. 



Razor-fifli. See fpout-fifh. 



Rein-deer, the chief food of the Laplanders, 215. 



Eefpiration. Air necelTary to the exiftence of all animal and vegetable bodies, 103 

 The mode in which refplration is carried on by man and the larger land animals, 

 103. Dr Crawford has rendered it probable that refpiration is the caufe of animal 

 hear, 104. Connefted with the circulation of the blood, 107. Commences in ftant- 

 ly after birtb, and continues during life, 108. Of laughing, 109. Of weeping, ibid. 

 Many fcccndary advantages derived from refpiration, no. Birds refpire by the 



bones. 



