sliver of bone and thread of tendon, can hold the body of the bird in almost any position, while the vainly hidden clusters of insect eggs are pried into. Without ceasing a moment in their busy search for food, the fluffy feathered members of the flock call to each other, “Chick-a-chick-a-dee-dee!” but now and then the heart of some little fellow bubbles over, and he rests an instant, sending out a sweet, tender, high call, a “Phœ-be!” love note, which warms our ears in the frosty air and makes us feel a real affection for the brave little mites.

Our song sparrow is, like the poor, always with us, at least near the coast, but we think none the less of him for that, and besides, that fact is true in only one sense. A ripple in a stream may be seen day after day, and yet the water forming it is never the same, it is continually flowing onward. This is usually the case with song sparrows and with most other birds which are present summer and winter. The individual sparrows which flit from bush to bush, or slip in and out of the brush piles in January, have doubtless come from some point north of us, while the song sparrows of our summer walks are now miles to the southward. Few birds remain the entire year in the locality in which they breed, although the southward movement may be a very limited one. When birds migrate so short a distance, they are liable to be affected in colour and size by the temperature and dampness of their respective areas; and so we find that in North America there are as many as twenty-two races of song sparrows, to each of which has been given a scientific name. When you wish to speak of our northeastern song sparrow in the latest scientific way, you must say Melospiza cinerea melodia, which tells us that it is a melodious song finch, ashy or brown in colour.

Our winter sparrows are easy to identify. The song sparrow may, of course, be known by the streaks of black and brown upon his breast and sides, and by the blotch which these form in the centre of the breast. The tree sparrow, which comes to us from Hudson Bay and Labrador, lacks the stripes, but has the centre spot. This is one of our commonest field birds in winter, notwithstanding his name.

The most omnipresent and abundant of all our winter visitors from the north are the juncos, or snowbirds. Slate coloured above and white below, perfectly describes these birds, although their distinguishing mark, visible a long way off, is the white V in their tails, formed by several white outer feathers on each side. The sharp chirps of juncos are heard before the ice begins to form, and they stay with us all winter.

We have called the junco a snowbird, but this name should really be confined to a black and white bunting which comes south only with a mid-winter’s rush of snowflakes. Their warm little bodies nestle close to the white crystals, and they seek cheerfully for the seeds which nature has provided for them. Then a thaw comes, and they disappear as silently and mysteriously as if they had melted with the flakes; but doubtless they are far to the northward, hanging on the outskirts of the Arctic storms, and giving way only when every particle of food is frozen tight, the ground covered deep with snow, and the panicled seed clusters locked in crystal frames of ice.

The feathers of these Arctic wanderers are perfect non-conductors of heat and of cold, and never a chill reaches their little frames until hunger presses. Then they must find food and quickly, or they die. When these snowflakes first come to us they are tinged with gray and brown, but gradually through the winter their colours become more clear-cut and brilliant, until, when spring comes, they are garbed in contrasting black and white. With all this change, however, they leave never a feather with us, but only the minute brown tips of the feather vanes, which, by wearing away, leave exposed the clean new colours beneath.

Thus we find that there are problems innumerable to verify and to solve, even when the tide of the year’s life is at its lowest ebb.

Let us suppose that a heavy snow has fallen and that we have been a-birding in vain. For once it seems as if all the birds had gone the way of the butterflies. But we are not true bird-lovers unless we can substitute nature for bird whenever the occasion demands; specialisation is only for the ultra-scientist.

There is more to be learned in a snowy field than volumes could tell. There is the tangle of footprints to unravel, the history of the pastimes and foragings and tragedies of the past night writ large and unmistakable. Though the sun now shines brightly, we can well imagine the cold darkness of six hours ago; we can reconstruct the whole scene from those tiny tracks, showing frantic leaps, the indentation of two wing-tips,—a speck of blood. But let us take a bird’s-eye view of things, from a bird’s-head height; that is, lie flat upon a board or upon the clean, dry crystals and see what wonders we have passed by all our lives.

Take twenty square feet of snow with a streamlet through the centre, and we have an epitome of geological processes and conditions. With chin upon mittens and mittens upon the crust, the eye opens upon a new world. The half-covered rivulet becomes a monster glacier-fed stream, rushing down through grand canyons and caves, hung with icy stalactites. Bit by bit the walls are undermined and massive icebergs become detached and are whirled away. As for moraines, we have them in plenty; only the windrows of thousands upon thousands of tiny seeds of which they are composed, are not permanent, but change their form and position with every strong gust of wind. And with every gust too their numbers increase, the harvest of the weeds being garnered here, upon barren ground. No wonder the stream will be hidden from view next summer, when the myriad seeds sprout and begin to fight upward for light and air.

If we cannot hope for polar bears to complete our Arctic scene, we may thrill at the sight of a sinuous weasel, winding his way among the weeds; and if we look in vain for swans, we at least may rejoice in a whirling, white flock of snow buntings.

A few flakes fall gently upon our sleeve and another world opens before us. A small hand-lens will be of service, although sharp eyes may dispense with it. Gather a few recently fallen flakes upon a piece of black