338 ' HE MIGRATION OF BIRDS. 
Hybopses are not as*widely different as supposed; and that 
Hybognathus osmerinus is, in truth, not ‘ specifically” di 
from the allied argyritis; that, in fact, it would be more cons 
to consider these all, as we did the small blue Stilbe a our 
creeks. 
If, by a “species,” we meant anything other than a conveni 
primitive form of omnivorous fresh-water fish, that has given 
to a variety of forms, through a long series of generations, t 
would, each in its own place and time, suit the particular ha 
it chanced to frequent or was forced to occupy ; if we have 
other thought in view, then, it would be — inconsistent 
add to the long list of so-called “ species.” We do not, how 
consider *‘ species” otherwise than as here sketched out, and | 
sidering also the amount of variation among any considera 
number of individuals of any one “species,” and believing that 
varieties are steadily though slowly becoming more and more Va 
ried, and so gradually entering what may be termed “ specific te 
ritory,” we claim that no undue use of the imagination will be 
brought into play, in recalling a primitive, typical oya 
we range, side by side, adult and young specimens of each of 
the sixteen “species,” that we have met with so far, i 
ware River and its tributaries, in central New Jersey. 
THE MIGRATION OF BIRDS. 
BY T. MARTIN TRIPPE. 
Tuere is nothing connected with the fascinating study aion 
are portarined that our very apaadi lends an 
to the mysterious interest involved. Anemones sað butt 
spring up in a day, where yesterday they were ye but 
come, we might have found the sprouting blades 
