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 Apprentices' High School had been established in Philadelphia, and while it was still an evening school, Mr. Rock took charge of it, and kept it until it was merged into a day school, under the direction of Professor Reason. He attended lectures in the American Medical College, and graduated in 1852.

In 1853, Dr. Rock came to Boston, where he now resides. On leaving the city of Philadelphia, the professors of the Dental College gave him letters bearing testimony to his high professional skill and integrity. Professor Townsend writes, "Dr. Rock is a graduate of a medical school in this city, and is favorably known, and much respected, by the profession. Having seen him operate, it gives me great pleasure to bear my testimony to his superior abilities." Professor J. F. B. Flagg writes, "I have seen his operations, and have been much pleased with them. As a scientific man, I shall miss the intercourse which I have so long enjoyed in his acquaintance." After Mr. R. graduated in medicine, he practised both of his professions. In 1856, he accepted an invitation to deliver a lecture on the "Unity of the Human Races," before the Massachusetts legislature. In 1857, he delivered the oration on the occasion of the dedication of the new Masonic Temple in Eleventh Street, Philadelphia. His intense application to study and to business had so undermined his health that, in the summer of 1856, he was obliged to give up all business. After several unsuccessful surgical operations here, and when nearly all hope for the restoration of his health was gone, he determined to go to France. When he was ready to go, he applied to the government for a passport. This was refused, Mr. Cass, then secretary of state, saying in reply, that