180 ANALOGIES DECEPTIVE. 



logies, to create difficulties for ourselves. Be- 

 gardless of that latitude already alluded to, 

 fixing more the attention on the periodical 

 changes of animals of the higher classes, we 

 are too apt to presume there is the same 

 regularity in the changes of the lower ; but 

 this does not necessarily follow : on the con- 

 trary, the lower we descend in the scale of 

 beings, the wider, I apprehend, will be the 

 range of time for the metamorphosis to- which 

 the several species are subject. In the instance 

 of the frog, to give an example, I have 

 known the change from the tadpole to the 

 perfect animal arrested for many weeks, when 

 the supply of food has been scanty. Eecurring 

 to the Stormontfield experiment, may it not 

 be inferred that those which migrated first, 

 were probably those of greatest vigour, and had 

 the lion's share of food ; and vice versa of those 

 remaining? 



AMICTJS. You spoke of the interest in the 

 inquiry being increased, by bringing into use 

 the microscope. 



PISCATOR. And to an almost unlimited 

 degree ; indeed, I believe that the subject 

 the microscopic examination of the embryo 



