The farmers say a deep snow draws the frost out of the ground. It is certain that the frost goes out when the ground is deeply covered for some time, though it is of course the warmth rising up from the depths of the ground that does it. A winter of deep snows is apt to prove fatal to the peach buds. The frost leaves the ground, the soil often becomes so warm that angle-worms rise to near the surface, the sap in the trees probably stirs a little; then there comes a cold wave, the mercury goes down to ten or fifteen below zero, and the peach buds are killed. It is not the cold alone that does it; it is the warmth at one end and the extreme cold at the other. When the snow is removed so that the frost can get at the roots also, peach buds will stand fourteen or fifteen degrees below zero.
March 7, 1881. A perfect spring day at last,--still, warm, and without a cloud. Tapped two trees; the sap runs, the snow runs, everything runs. Bluebirds the only birds yet. Thermometer forty-two degrees in the shade. A perfect sap day. A perfect sap day is a crystalline day; the night must have a keen edge of frost, and the day a keen edge of air and sun, with wind north or northwest. The least film, the least breath from the south, the least suggestion of growth, and the day is marred as a sap day. Maple sap is maple frost melted by the sun. (9 P. M.) A soft, large-starred night; the moon in her second quarter; perfectly still and freezing; Venus throbbing low in the west. A crystalline night.
March 21, 1884. The top of a high barometric wave, a day like a crest, lifted up, sightly, sparkling. A cold snap without storm issuing in this clear, dazzling, sharp, northern day. How light, as if illuminated by more than the sun; the sky is full of light; light seems to be streaming up all around the horizon. The leafless trees make no shadows; the woods are flooded with light; everything shines; a day large and imposing, breathing strong masculine breaths out of the north; a day without a speck or film, winnowed through and through, all the windows and doors of the sky open. Day of crumpled rivers and lakes, of crested waves, of bellying sails, high-domed and lustrous day. The only typical March day of the bright heroic sort we have yet had.