Msgr. Doty specializes in solid, old-fashioned books, and his most recent work is a solid, old-fashioned examination of the nature and variety of prayer. It is ""solid"" because the author is at pains to remain within the well plowed and wholly orthodox furrows of conventional spirituality, even in his treatment of such phenomena as Pentecostal meetings. And it is ""old-fashioned"" for the same reason -- and because his style is that curious admixture of didacticism and forced bonhomie familiar to frequenters of ""missions"" and ""retreats."" Somewhere in this smooth mass of definitions, exhortations and examples, there is a hard core of practicality struggling to emerge. But, as it stands, and so far as the marketplace is concerned, the book hasn't a prayer.