Book of, in the history of the church of Scotland, is a common order drawn up by the assembly of ministers in 1650, for the reformation and uniformity to be observed in the discipline and policy of the Church. In this book the government of the church by prelates is set aside; kirk sessions are established; the superstitious observation of fast days and saint days is condemned, and other regulations for the government of the church are determined. This book was approved by the privy council, and is called the first book of discipline.