``To those standing outside,'' Laskin writes, ``it looked like the northwest corner of the sky was suddenly filling and bulging and ripping open.'' In four and a half hours the temperature at Helena, Mont., fell 50 degrees. The prairie air tingled with the electricity of a horizontal thunderstorm. All over the region, school teachers, many of them not much older or more educated than their pupils, had to make life and death decisions about how to get the children home.

     ``The fear came first,'' Laskin writes, ``but the cold followed so hard on its heels that it was impossible to tell the difference.'' In minutes nostrils were clogged by ice. Eyelids were torn by repeated attempts to prevent them from freezing shut. Unable to see their hands in front of their faces, people died wandering a few yards from their houses, unable to hear, over the keening wind, pots being pounded a few yards away to tell them the way to safety.

     ``For years afterward,'' writes Laskin, ``at gatherings of any size in Dakota or Nebraska, there would always be people walking on wooden legs or holding fingerless hands behind their backs or hiding missing ears under hats -- victims of the blizzard.'' Lena learned to walk on a wooden foot. In 1901, at 24, she married. At 25 she died, perhaps in childbirth, or perhaps of a complication from the amputation necessitated by frostbite.

     ``Lena was laid to rest in her wedding dress in the graveyard of the Immanuel Lutheran Church near the country crossroads called Ruby. If there ever was a town called Ruby, it has disappeared, as has the Immanuel Lutheran Church. The church cemetery remains -- a fenced patch of rough grass studded with headstones between two farmhouses not far from the interstate. A tiny island of the dead in the sea of Nebraska agriculture.''

     This Thanksgiving, when you have rendered yourself torpid by ingesting an excess of America's agricultural bounties, summon thoughts of thanks for the likes of Lena, those whose hard lives paved the stony road to America's current comforts.