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There was much dispute among ornithologists some time 
as to whether the cow-bird ever laid more than one egg 
the same nest. It was finally admitted that there were some 
times two placed in the same nest, but that one of th 
were all sound, and had, apparently, been hatching for 
days. Professor Baird, of the Smithsonian Institution, 
formed me, that, in company with Dr. Brewer, he fot t 
three eggs in a nest of the creeper, and that they considerel 
which it possesses quite a variety. Its most frequent 
in spring, is a very fine, almost shrill song ; but besides | 
it sometimes, though rarely, gives utterance to a soft, li 
warble, quite like that of the redstart. oe 
It is, perhaps, superfluous to speak of the Yellow Warbler 
(D. estiva). This, as is well known, is the commonest tl 
most familiar of all its family ; and, spending the spring wi 
summer with us, all its habits have long been known. 
cannot but think, however, that sufficient justice has 
been done to its song. Some authors even seem to be 
rant of the fact that it has a song at all, only giving it 
for its rather harsh, but characteristic spring note. It 
however, a true sylvicoline warble, which is suficie! 
pleasant in itself, but derives additional interest from 
being heard late in summer, long after all other birds, 
the vireos, have ceased to sing. During the latter pa 
July, and all through August, the yellow warbler may 
heard singing in the early morning, or in the twiligh 
his sweet, liquid notes, pleasing as they always wi 
which were scarcely noticed at all in May and Ju F 
concert of finer and louder voices, now sound doubly 
amid the silence that reigns among the feathered chion 
The Black-throated Blue Warbler (D. Canadensis) * 
about the first week in May, and takes up his quarters 
low and swampy woodlands, where he finds his 
