It is not often that there is published a monumental work of scholarship involving years of research and study precisely at a time when the subject is a matter of lively discussion and of great differences of opinion. The question of the relation of Church and State is one of the most important issues of our day. It is being debated in lesiastical circles, in legislative halls, and in the press. Its implications are being weighed in our courts and learned judicial decisions are being handed down which spell out the meaning for today of this fundamental American principle. And here is a careful, objective and scholarly study which should be an indispensable reference book for all who wish to be informed about the subject. The ground covered by Dr. Stokes in these three volumes is defined as ""an historical survey, source-book, and interpretation of documents and events showing the growth of religious freedom under the friendly constitutional separation of Church and State, and the resulting influence of religion in all major phases of national development; also a study of the status of churches under federal and state constitutions, statutes and judicial decisions; authoritative opinions on matters at issue by courts, Church bodies, statesmen, religious leaders and publicists and a discussion of contemporary problems of adjustment."" The author was for twenty years Secretary of Yale University and later Canon of Washington Cathedral. This is a thorough study, carefully annotated, and indexed and with extensive bibliographies, Indispensable for research and reference.