6 PREFACE. 



which exists between the natural and the spir- 

 itual — ^between what man can learn from the 

 physical creation, and what has been revealed 

 to him by the Spirit of God. To do this with 

 as much fairness as possible, and with due 

 regard to the present state of knowledge and 

 to the most important difficulties that are like- 

 ly to be met with by honest inquirers, is the 

 purpose of the following pages. 



It is proper to add that, in order to give com- 

 pleteness to the discussion, it has been neces- 

 sary to introduce, in some of the lectures, topics 

 previously treated of by the author, in a similar 

 manner, in publications bearing his name. 



J. W. D; 



April, i88a. 



