The noted French Catholic author offers here studies in certain major crises in the history of church dogma; in the light of the recent Ecumenical Councils. His purpose is to give his readers a ""sense of futures that did not come to be,"" and how the heretic might have been orthodox were not heresy often a ""blooming in advance of the season."" As a conservative and devout Catholic, he sees Catholicism as ""the form of the all, the axis of evolution,"" and ""the locus of the final recapitulation"" to which the whole Church will come in time. After a brief chapter giving definitions and dates, he considers Judaism, Gnosticism, Arianism, Islam, Catharism, the Protestant Reformation, and finally, The New Dismemberment brought on by the fact that today, ""faith is growing cold."" Though ardent in his Catholicism, the author has a warm and compassionate attitude toward the heretical movements, past and present, which he contemplates in these studies.