As a public speaker Mr. Rock stands deservedly high; his discourses being generally of an elevated tone, and logically put together. As a member of the Boston bar, he has thus far succeeded well, and bids fair to obtain his share of public patronage. In personal appearance Mr. Rock is tall and of good figure, with a thoughtful countenance, and a look that indicates the student. In color he is what is termed a _grief_, about one remove from the negro. By his own color he has long been regarded as a representative man. WILLIAM DOUGLASS. William Douglass was a clergyman of the Protestant Episcopal denomination, and for a number of years was rector of St. Thomas Church, Philadelphia. We met Mr. Douglass in England in 1852, and became impressed with the belief that he was no ordinary man. He had a finished education, being well versed in Latin, Greek, and Hebrew. He possessed large and philanthropic views, but was extremely diffident, which gave one the opinion that he was a man of small ability. Being in Philadelphia in the spring of 1860, we attended the morning service at his church. When the preacher made his appearance, all eyes were turned to the pulpit. His figure was prepossessing--a great thing in a public speaker. Weak, stunted, deformed-looking men labor under much disadvantage. Mr. Douglass had a commanding look, a clear, musical voice, and was a splendid reader. He was no dull drone when the service was over and the sermon had commenced. With downcast eye he read no moral essay that touched no conscience and fired no heart. On the contrary, he was spirited in the pulpit. He looked his congregation in the face; he directed his discourse to them. He took care that not a single word should lose its aim. No one fell asleep while he was speaking, but all seemed intensely interested in the subject in hand. Mr. Douglass was a general favorite with the people of his own city, and especially the members of his society. He was a talented writer, and published, a few years ago, a volume of sermons, which are filled with gems of thought and original ideas. A feeling of deep piety and humanity runs through the entire book. Mr. Douglass was of unmixed blood, gentlemanly in his manners, chaste in conversation, and social in private life. Though not active in public affairs, he was, nevertheless, interested in all that concerned the freedom and elevation of his race. He visited England and the West Indies some years ago, and had an extensive acquaintance beyond the limits of his own country. Mr. Douglass was respected and esteemed by the white clergy of Philadelphia, who were forced to acknowledge his splendid abilities. ELYMAS PAYSON ROGERS.