282 DIRECTIONS. 



Unio. They may all be tenable ; and I would 

 riot in any case, set up my doubts against the con- 

 victions of these industrious naturalists. But I 

 prefer delaying any farther adoption of their new 

 species, until they have extended their collections 

 and made farther comparisons. I have the same 

 objections to the adoption of other proposed new 

 species of animals from other naturalists, which I 

 might have introduced for students* exercises. I 

 consider this part of Natural History as very un 

 settled in America ; and that it is, as it were, just 

 emerging from a chaotic state it is so, at any rate^ 

 in mi/ own mind. 



