The first part of this book presents the studies of the Author in preparing a Memorial Oration delivered in the city of New York, November 10, 1883, on the four hundredth anniversary of the birth of Martin Luther. The second part presents his studies in a like preparation for certain Discourses delivered in the city of Philadelphia at the Bi-Centennial of the founding of the Commonwealth of Pennsylvania. There was no intention, in either case, to make a book, however small in size. But the utterances given on these occasions having been solicited for publication in permanent shape for common use, and the two parts being intimately related in the exhibition of the most vital springs of our religious and civil freedom, it has been concluded to print these studies entire and together in this form, in hope that the same may satisfy all such desires and serve to promote truth and righteousness.