Florida—'"Sir," said Dr Johnson, "we had good talk."' Throughout his life Rogers delighted to recall the varied charms of this and similar expeditions under the command of Professor Bache.
After the return from his wedding tour in Europe he was busily occupied, until the breaking out of the Rebellion in 1861, in giving series after series of Lectures on Physics and its branches at The Franklin Institute and on Civil Engineering at The University of Pennsylvania, where he had been installed in the chair of that department. Later, in 1861, he delivered a lecture on 'Roads' before The Smithsonian Institution in Washington; and still later, in 1863, he held for a year the appointment of Lecturer in Harvard College. All these Lectures were marked by complete mastery of the subject, by thorough minuteness of detail, coupled with clearness of exposition and a quiet, refined manner of delivery, utterly devoid of pedantry or pretence.
In 1857 he was elected a member of The American Philosophical Society,—the youngest man, it was so stated at the time, (he was only twenty-four years of age) on whom this honour had been conferred. In the summer of the same year he accompanied Professor Bache to Maine, again as a volunteer aid, for the purpose of measuring the Epping Base Line, near Cherryfield, in that State.
The outbreak of the Rebellion found Professor
