CONTENTS. xiii 



CHAP. XIX. 



Page 

 Of the Principle of Imitation in Animals — Is the neareji approach 

 to reafoning and language - » _ . ^6^ 



CHAP. XX. 



Of the Migration of Animals — More general than commonly he- 

 Ueved — The probable motives "which induce animals to mi- 

 grate 473 



CHAP. XXI. 



Of the Longevity and Death of Animals — A comparative vieiv 

 of animals -with regard to the duration of life^ and its confe- 

 quences ---___ ^04 



CHAP. XXII. 



Of the Progreffive Scale of Animals— fops at man, and -why — 

 In this ivorld, it appears to be impojjible that a being fuperior 

 to man could exifl — Reafonsfor this opinion - - 520 



ERR A- 



