In just such impenetrable retreats as the marsh wrens choose, another wee brown bird may sometimes be seen springing up from among the sedges, singing a few sweet notes as it flies and floats above them, and then suddenly disappearing into the grassy tangle.

It is too small, and its breast is not streaked enough to be a song sparrow, neither are their songs alike; it has not the wren's peculiarities of bill and tail, its bright-bay crown and sparrowy markings finally identify it.

A suggestion of the bird's watery home shows itself in the liquid quality of its simple, sweet note, stronger and sweeter than the chippy's, and repeated many times almost like a trill that seems to trickle from the marsh in a little rivulet of song. The sweetness is apt to become monotonous to all but the bird itself, which takes evident delight in its performance.

In the spring, when flocks of swamp sparrows come north, how they enliven the marshes and waste places. And yet the song, simple as it is, is evidently not uttered altogether without effort, if the tail-spreading and teetering of the body after the manner of the ovenbird, are any indications of exertion.

Nuttall says of these birds: "They thread their devious way with the same alacrity as the rail, with whom, indeed, they are often associated in neighborhood. In consequence of this perpetual brushing through sedge and bushes, their feathers are frequently so worn that their tails appear almost like those of rats."

But the swamp sparrows frequently belie their name, and, especially in the South, live in dry fields, worn-out pasture lands with scrubby, weedy patches in them.

They live upon seeds of grasses and berries, but Dr. Abbott has detected their special fondness for fish -- not fresh fish particularly, but rather such as have lain in the sun for a few days and become dry as a chip. Their nest is placed on the ground, sometimes in a tussock of grass or roots of an upturned tree quite surrounded by water.

Four or five soiled white eggs with reddish-brown spots are laid usually twice in 2 season.

TREE SPARROW (Spizella monticola) Finch family

Called also: CANADA SPARROW; WINTER CHIPPY; TREE BUNTING; WINTER CHIP-BIRD; ARCTIC CHIPPER

Length -- 6 to 6.35 inches. About the same size as the English sparrow. Male -- Crown of head bright chestnut. Line over the eye, cheeks, throat, and breast gray, the breast with an indistinct black spot on centre. Brown back, the feathers edged with black and buff. Lower back pale grayish brown. Two whitish bars across dusky wings; tail feathers bordered with grayish white. Underneath whitish. Female -- Smaller and less distinctly marked.

Range -- North America, from Hudson Bay to the Carolinas, and westward to the plains.

Migrations -- October. April. Winter resident.

A revised and enlarged edition of the friendly little chipping sparrow, that hops to our very doors for crumbs throughout the mild weather, comes out of British America at the beginning of winter to dissipate much of the winter's dreariness by his cheerful twittering.