6 UNDISCOVERED PRINCIPLES. 



to which belong the important operations of vitality, 

 whether manifested in the plant or the animal. In 

 treating of these, although speculation cannot be entirely 

 avoided, it will be employed only so far as it gives any 

 assistance in linking phenomena together. 



We have to deal with the active agencies which give 

 form and feature to nature which, regulate the harmony 

 and beauty and vigour of life and upon which depend 

 those grand changes in the conditions of matter,, which 

 must convince us that death is but the commencement 

 of a new state of being. 



