that connect the Orders and Families of Birds. 509 



observed to prevail between the parallel or corresponding groups 

 in the table before us. The investigation of such points would 

 lead to a discussion which would far exceed the limits proposed 

 in this brief inquiry. 1 have already entered into some explana- 

 tion of the principles that regulate such relations of analogy, 

 when investigating the order of Insessores ; and the application of 

 the same principles to the present table will afford much interest, 

 and suggest many important inferences, to those who are familiar 

 with the groups of ornithology. 



N. B. By an oversight of the printer's, the circles in the diagram at page 468 were not made to 

 touch each other, as in the diagram above ; and they thus seem to convey an erroneous idea of the 

 series of affinity being incontinuous. 



3 u 2 Having 



