For the gourmet market-for those who enjoy cookbooks like Thoughts on Food and Escoffier Cookbook. Not for the average housewife. Man-about-town Crosby Gaige, authority on dining out, on fine food and drink, intimate of famous writers, artists, tycoons the country over, here shares an accumulation of menus and recipes contributed by his fellow-travellers- in-the-culinary-arts. With deep concern for lifting the quality of American food, Crosby Gaige has given connoisseurs a collection of specialty dishes, presented as parts of menus, with directions for preparation that even the inexpert cook will find easy to follow. There are good ideas for special occasions; there are recipes for foods (and drinks) enjoyed and not readily identified, some with regional flavor, some associated with the names of famous chefs.