To the fiill professorship in this department he finally received an appointment from General Jackson in 1836, and continued to fill the position until 1871, when he resigned and was appointed colonel in the regular army on the retired list. The instrument by which he was appointed to his professorship in 1836 is still in his possession. It was forwarded to General Cass, and sent by him, through his son, to Professor Bartlett. It was as follows:

" I hereby appoint Second Lieut. 'Williaiu H. C. liartlett, of the Corps of Engineers, Prof, of Nat. and Exper. I'liilosophy (vice Courtney resigned.

(Signed,) .\m>re\v Jackson.

During the student days of Professor Bartlett, as we have seen, he spent two years in teaching in the academy. Many men, afterwards distinguished in United States history, and several who, on both sides, in our civil contest, became men of mark, were at the institution. Leonidas Polk, a relative of James K. Polk, and afterwards Bishop of Louisiana, was his room-mate, and Albert Sidney Johnston, afterwards killed at the battle of Shiloh, was both his room-mate and classmate. Jefferson Davis, Robert E. Lee and Charles Mason (afterwards Judge Mason, of Iowa) were under his instruction, as were many others who in due time became widely noted.

While engaged in the construction of Fort Adams, between 1829 and 1832, Professor Bartlett contributed to SiUimnn^s Journal a paper on " The Expansibility of Coping Stones," which has been frequently referred to by foreign writers. During his life in Washington (1832 to 1834), as first assistant to Chief Engineer (General) Gratiot, he had a great deal to do with the engineering on the Cumberland National road, and with fortifications all over the country. In 1840 he was ordered by President Van Buren, through his Secretary of War, Mr.