Remarks on the caufe of the acute 

 fenfe of fmelling in various 

 animals. 



13. Of the EARS. 



Of the variety in the fhape, fitu- 

 ation and ufes of the external 

 ear. 



14. Of the EYE. 



Its ftru&ure in different animals. 

 Of the mufculusfufpenforius. 



15. Of the membrana niftitans. 



16. Of the figure of the pupil in dif-- 

 ferent animals. 



Of its extreme dilatability in 

 fome animals, as in the cat, 

 &c. 



17. Of the different colours of the 

 choroid coat, or Tapetum, in dif- 

 ferent animals. 



Why certain animals are ena- 

 bled to fee with very little 

 light, 



La 18. Of 



