In 1839 he published a " Treatise on Optics ;" in 1858, one on "Synthetical Mechanics," and another on "Spherical Astronomy," and in 1859 one on " Acoustics and Optics " and another on " Analytical Mechanics." Before finally retiring from his professorship he also published an article entitled " Strains on Rifle Guns," which will be found in the Memoirs of the National Academy of Sciences, Volume I. It was also separately published. All this shows the years of his life at West Point to have been busy and productive. In 1847 Geneva College conferred upon the professor the degree of Doctor of Laws. The degree of Master of Arts had been conferred upon him as an honorary degree by the College of New Jersey, at Princeton, ten years before. He is a member of the Philosophical Societies of Philadelphia and Boston, and is one of the original corporators of the American Academy of Science, incorporated by Congress.

His books and his writings in periodicals are a monument to Professor Bartlett's scholarship and industry. The value of his books may be inferred from the fact that they have passed through a succession of editions. The ninth edition of " Analytical Mechanics" was published in 1874. AVe judge from a mere pa.ssing sentence in the preface to the second edition that, in the so-called conflict between scientists and the Bible, this eminent scholar and scientist has no sympathy with Anti-Theism. Speaking of a mathematical formula which he framed and which expresses the laws that govern the action and reaction of forces upon bodies, he says of this formula, --