"You all know in a general way," I went on, "the astronomical reasons for our alternating day and night--our succession of seasons, spring, summer, autumn and winter. Yet if you follow me closely now, and picture what I tell you, the subject will be clearer to your mind, and you will understand the change which is now upon us. Some of you, our government has advised, should remain in the north and withstand the rigors of the new climate. New York City will not be abandoned! That is absurd! It is the sudden change, the upset to our normal routine, which has now caused suffering. "When we are equipped for the new conditions, New York and other cities in its latitude will be perfectly habitable. We will have winter nights several months long, and an arctic cold. Then spring, and a summer with the sun giving us months of unending daylight. Those must be our productive months--we must grow food then, to supply the southern hemisphere, just as in the other months they must grow food down there. "Do not be too hasty! We cannot all--every one on earth--rush at once to the Equator! Even there at times it will be too hot, and a twilight winter fairly cold. Cold enough, a month or two from now, to disorganize everything. "It is your panic--your haste--which is our greatest danger. Be calm! Meet the conditions as they are. Help our government to maintain order, here in the north. The world's work must be done--the new conditions must be coped with sanely. We are not in desperate distress; only through panic can real disaster come!" * * * * * These were our broadcasted words of government appeal. And then I went on: "There is no need for panic. We want you to understand the astronomical reasons for our new climate. I want you to imagine yourself standing before your round, empty dining room table. Conceive that the room is dark and that you have placed, almost in the center of the table, a circular vacuum globe of yellow light. That represents the sun. "Take now an orange, and through its center put a lead pencil. The orange is the earth. By holding in your fingers the ends of the lead pencil, you can rotate the orange. The lead pencil then represents the axis of the earth. "Can you picture yourself in your darkened room under these conditions? As you stand facing the round table with the light near its center, you hold the orange on its lead pencil to the right of you near the edge of the table. You hold the lead pencil vertical; its point, standing directly up to the ceiling would be then our North Pole; its eraser, pressed against the table edge, would be our South Pole. "You will find now that the light from your 'sun' illuminates about half the orange--the half which faces toward the sun. The orange is lighted from the North Pole to the South Pole--on the sunward side. The other side is in shadow.