696 NOTES TO BOOK XVIII. 



Book, was attempted to be solved in the fourth. But by 

 incorporating this fourth Book with the first, and thus 

 prefixing to the study of existing causes arguments against 

 the belief of their geological insufficiency, there is an 

 appearance as if the author wished his reader to be pre- 

 pared by a previous pleading against the doctrine of 

 catastrophes, before he went to the study of existing 

 causes. The Doctrines of Catastrophes and of Uniformity, 

 and the other leading questions of the Palaetiological 

 Sciences, are further discussed in the Philosophy of the 

 Inductive Sciences, Book x. 



THE END. 



