...and I undertook again the microscopic work which I had begun in Newburyport under the guidance of an accomplished biologist, Dr. Henry C. Perkins. He had also introduced me to the works of Oken and Richard Owen ; and I had written for the Christian Examiner (July, 1852) a paper called Man and nature, given first as a lyceum lecture, which expressed something of that morning glow before sunrise which existed...