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 eon 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 Now South Wales, .will describe to us tonight.