The Birds’ Calendar 
its nest being commonly lined with horsehair it 
gets the name of ‘< hair-bird.’’ 
Almost a fac-simile, enlarged, of the chipping 
sparrow, with a bright chestnut crown, and aptly 
called the ‘‘ arctic chipper,’’ from its breed- 
ing only in arctic regions, is a bird more com- 
monly known as the tree sparrow, but with lit- 
tle propriety in the prefix, as it is oftener found 
on the ground than elsewhere, and does not 
commonly nest in trees. It isa denizen of our 
woods in winter, although I have seen it in the 
Ramble only during migration. It was then 
almost silent, but in its summer haunts it is said 
to be a very pleasing singer. In the case of 
species so nearly identical as the common and 
the Arctic chippers, it would be very interest- 
ing to know wherein consists that subtle tem- 
peramental distinction that drives them to such 
diverse latitudes. 
One of the largest and most important groups 
of birds in this country is the one known as the 
‘¢warblers.’’ Especially graceful in form and 
motion, with brilliant plumage, pleasing if not 
remarkable songsters, and in their habits thor- 
oughly beneficial to vegetation, the warblers 
deservedly rank high in the estimation of bird- 
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