L50 



THE AMERICAN NATURALIST [Vol. XLII 



the faculty of sensation is lost in a part (of an animal) in which the 

 nerves supplying it have been destroyed; now the question is whether 

 every nerve produces a sensation when it is affected, and whether the 

 nerves which bring- the muscles in action as well as those which furnish 

 the forces of action to the organs produce sensation, like the rest; or 

 whether there are not particular and special nerves for the production 



the others only for putting different organs in a condition to execute 

 their functions? 



"Tenth Question. — Is there some constant and peculiar sign which 

 will make ns understand that a being differing from ourselves ex- 



\ *■ 1 ».v i y n 

 :*.*.•;:: »\ 'o° l 



OS- ° £p« 



periences a sensation when it is stimulated (affcrtr), and can one 

 always accept as a test the similar movement which it then executes; 

 or, however in general an animal gives no other sign of a sensation 

 produced than by the movements of its parts, can not these movements 

 often deceive us and be due only to the irritahility excited in the parts 



(I know no certain sign of a sensation produced save a cry evoked 

 by pain: but all animals are not able to give such a sign and those 



