The tradition of snow at Christmas, may be, so far as the Englishman is concerned, little more than a tradition today; but the thought of Christmas without snow (even if confined to greeting-cards) is unthinkable. It requires more effort of imagination than most of us can conjure up, to think of roast turkey picnics under a blazing sun, crackers in the open air, or Christmas bells in a dawn of summer heat. But such it is in Australia; and it is of such Christmas days that Mrs. Holman, who is the wife of W.A. Holman. K.C., one time Premier of New South Wales, will describe to us tonight.