In 1845 he accepted the chair of Greek in a neighboring college, which afforded him leisure for his scientific pursuits. After an absence of seven years the Professor returned to his old friend, Colonel Stamps and family, where he remained some two years, leaving them to settle in Cincinnati.

During his stay at the Colonel's (1851) he became a member of the American Association for the Advancement of Science, and in 1852 contributed to it his first article, entitled "On the Motions of Numerous Small Bodies and the Phenomena Resulting Therefrom." Having accumulated a valuable collection of books on science and philosophy and obtained access to several libraries, public and private, in the city, he was now in a condition to devote most of his time and energies to his favorite sciences. For subsistence he delivered lectures before teachers' institutes and colleges till 1856, when an affection of the lungs compelled him to abandon the lecture field.

In the meantime he had offered papers for publication to Silliman's Journal, the principal scientific magazine of America at that time, but, receiving no response to his communications and being denied publication, he took the advice of a friend and sent his subsequent articles to the British Association for the Advancement of Science and to the Philosophic Magazine, where they were received with favor. He was much gratified to find his article on "Meteoric Astronomy" published in the report of the Liverpool meeting of the association in 1854. Six papers, which he subsequently sent in 1857, 1859 and 1861, met with similar favor.

For several years he visited schools, colleges and teachers' institutes in Oxford, Lebanon, Cleveland and other cities, lecturing on his favorite branches of science. It had been his intention to popularize the science of physical astronomy by the publication of tracts or pamphlets.

PUBLISHES PAMPHLETS.

In the year 1856, at the request of teachers before whom he had lectured at the institutes, and with a view to popularize scientific knowledge, the Professor commenced the publication of pamphlets. The first number treated of "The Geological Agency of Water and Subterranean Forces." Only two of these pamphlets came into the possession of the administrator. One of them was a good-sized volume, as may be inferred from the following articles it contained:

Some of these subjects had been treated of at greater length and published by American and British associations for the advancement of science.

He sent to the British Association for the Advancement of Science: