52 NATURAL THEOLOGY. 



of; not only distinct, but remote from any which 

 ?t had ever experienced, and greatly superior to 

 them. Yet this last animal has no more ground 

 for believing that its senses comprehend all things, 

 and all properties of things, which exist, than 

 might have been claimed by the tribes of animals 

 beneath it ; for we know that it is still possible to 

 possess another sense, that of sight, which shall 

 disclose to the percipient a new world. This fifth 

 sense makes the animal what the human animal 

 is : but to infer that possibility stops here ; that 

 either this fifth sense is the last sense, or that the 

 five comprehend all existence, — is just as unwar- 

 rantable a conclusion as that which might have 

 been made by any of the different species which 

 possessed fewer, or even by that, if such there be, 

 which possessed only one. The conclusion of the 

 one-sense animal, and the conclusion of the five- 

 sense animal, stand upon the same authority. 

 There may be more and other senses than those 

 which we have. There may be senses suited to 

 the perception of the powers, properties, and sub- 

 stance, of spirits. These may belong to higher 

 orders of rational agents; for there is not the 

 smallest reason for supposing that we are the 

 highest, or that the scale of creation stops with us. 

 The great energies of nature are known to us 

 only by their eflects. The substances which pro- 

 duce them are as much concealed from our senses 

 as the Divine essence itself. Gravitation, though 

 constantly present, though constantly exerting its 



