542 NOTES ON CERTAIN INLAND 
territory as breeding grounds, must come South in propor 
tion as they are compelled to relinquish territory at the North. 
At all events, there is a steadily increasing list of those mi- 
gratory birds that formerly never remained in New Jersey 
during the summer, and that now do so, raising one or more 
broods during their sojourn. To this statement the writer 
would add another, that the number of "isolated instances" 
of migratory species remaining, is also increasing. How 
many such “isolated instances” must occur to make the 
breeding of the bird within state limits a fixed fact? One 
nest a year or a dozen? Is it probable that the young birds 
raised in an "isolated instance" recognize their birth-place 
the ensuing spring and so remain?  Thereby we would have 
as the result of an accident, a permanent habit established 
among that particular species. Would we not? 
7. Ruby-crowned Kinglet (Regulus calendula). 8: Gold- 
en-crested Wren (Regulus satrapus). 
In the Kinglets, of all other birds, it would be supposed 
that we had those that were strictly, so far as New Jersey is 
concerned, a northern-breeding, Jersey winter-sojourning 
species; and, indeed, the great bulk of them are so, except 
that they go farther South, of course, as well as remain here. 
Nevertheless, they too, break in upon long established rules 
and the records. of the books, and have both been found 
breeding in Sussex county, New Jersey. At least, we have 
as evidence of this their presence in June, and also that of 
their young in August. Of those that spent the winter and 
left in the spring of 1869, there remained probably one per 
cent. The impression I may have given of their numbers 
during the summer, in the Geology of New Jersey, p. 169, 
is erroneous, in so far as one might suppose that they were 
common at that season. They are rare, but diligent search 
will generally discover two or three in the course of the 
summer. 
The Kinglets do not seem to be much affected by the 
severity of the winter; except that during severe snow- 
