Every time I read a book about foods written by the Browns, I feel I have missed my vocation, and that in another incarnation I shall ask to be official taster -- and on the side experimenter -- for the trio. Nobody else makes food sound quite so delectable. This particular book includes far more than the title would indicate, for full meals could be readily composed of the wide variety of classes into which their ""snacks"" fall. An inspiration for the hostess seeking original dishes for luncheon or supper parties, teas, cocktail parties or midnight kitchen raids. And a windfall for tearoom managers and restaurateurs.