This latest volume in the series under Father Kung's editorship comprises, like its predecessor volumes, a series of ""theological meditations"" intended specifically for priests and laymen with an adequate background in the ecclesiastical sciences. Karl Schelkle in ""The One Priesthood,"" examines the concept of ""priest"" as applicable ultimately to all Christians in a competent, sound and highly perceptive and original fashion, but this is so heavily laden with bad, old-fashioned wissen-schaftlich notions of scholarship that the reader is wearied long before he is edified. The second essay is ""Changes in Christian Spirituality,"" by Thomas Sartory, wherein the author surveys changing emphases in post- conciliar notions of the spiritual life. Sartory's work is as clear and as concrete as Schelkle's is pedantic and abstract. The final contribution, Michael Pfliegler's ""Celibacy,"" is an historically interesting and realistic survey of the pro's and con's of the clerical-celibacy question, with interesting sidelights drawn from modern fiction as well as from more traditional sources. Two out of three is a sufficiently high average to commend this collection to clerics and to thoughtful laymen.