This volume is the only publication of Christian Science Class Instruction authorized by a duly accredited practitioner while in good standing with the Church. As such, this book has great value not only to the students of Mary Baker Eddy's teachings but the historian, the philosopher, the metaphysician as well as the critic. Many valuable and historic sources are quoted in this work. This is one of those rare volumes that has as much pertinence today as when it was first published in 1945.