CLOUD HOWE Lewis Grassic Gibbon Doubleday, Doran ($2.50).
As every distiller knows, all Scotch whiskey is blended. So is Scots dialect. A blend not only of pungent Scots dialect and plain English but of symphony and satire, low comedy and drama that sometimes aspires to the tragic, Cloud Howe is a malty, fairly intoxicating brew. Author ''Lewis Grassic Gibbon" (J. Leslie Mitchell, British historian and archeologist) has already written one book about his heroine (Sunset Song), will write one more, but Cloud Howe stands sturdily enough alone.
When Chris and her parson...