The McCollom Institute, in Mont Vernon, New Hampshire, until 1871 called the Appleton Academy, was a high school between 1850 and 1906, when it closed due to low numbers. It was owned and operated by the local trustees of a trust which continued for many years after the end of its school.

The building was later the home of the private Stearns Academy until the 1930s, and was then used until the 1980s for the town's public school through grade 6. Now known as the McCollom Building, it is used for town offices and its police station.

In the 1840s, citizens of Mont Vernon wanted higher education for their children in the town, and in 1848 the Center District voted to build a new schoolhouse for the purpose. Money was raised by public subscription, in June 1850 the "Appleton Academy" was incorporated, the building was completed, and in the fall of that year the new school opened.^[1]

The name of Appleton seems to have been given in the hope of getting financial support from the Appleton family, particularly William Appleton of Boston, whose mother had lived in Mont Vernon with her daughters until her death in 1842, and his cousin Samuel Appleton, a notable philanthropist. In 1853, when a bigger schoolhouse was planned, William Appleton gave the school a library worth $700, equivalent to $25,637 in 2023, while Samuel gave $500 towards the cost of the new building, the biggest single donation, equivalent to $18,312 in 2023. In 1855, William gave another $100.^[1]

A visiting committee of notable people from Mont Vernon and the surrounding towns was established, including the Rev. J. G. Davis of Amherst.^[1]

The opening of the school was announced in the Farmers' Cabinet dated August 15, 1850, as follows:

APPLETON ACADEMY AT MONT VERNON, N. H.
The Trustees of Appleton Academy take pleasure in announcing to the friends of education, that they have recently completed their building, and are now prepared to open it to the public. They feel assured that the pleasant location of this Institution, and the universal interest of the people of Mont Vernon will insure success. And they also flatter themselves that they have secured such Teachers as will entitle them to a patronage and give satisfaction to those who may avail themselves of the opportunity offered them. The First Session will commence Aug. 21, and continue 12 weeks, under the instruction of L. B. Clough, A.B., aided by competent assistants. Tuition: Common English Branches, $3.50. Latin and Higher Branches, $4.00. Board can be had in good families, including rooms and lights, for $1.50 per week. Rooms can be obtained by students wishing to board themselves.
Per order of the Trustees.^[2]

Slightly more than half of the initial 52 students were girls, and all but six were from the town itself. However, L. B. Clough stayed as schoolmaster for only one term, and the school was not restarted until the fall of 1851. Numbers were then up to 77, including 34 girls, but it is not clear whether there was any teaching.^[3] By the school's third year, the numbers were up to 101, leading to the need for a bigger and better building, and it was built in 1853, 40 by 60 feet (12 by 18 m), three stories, with an upstairs school hall.^[1]

In 1858, a twelve-page Catalogue of Officers and Students of the Appleton Academy, Mont Vernon, N.H. was published.^[4]

In 1860, soon after graduating from Dartmouth College, Cecil Bancroft (1839–1901) was appointed as Principal of the school, where he stayed until 1864, leaving to marry Frances A. Kittredge, one of his students. He went on to be appointed as Principal of Phillips Academy Andover in 1873.^[5]

By 1871, attendance had fallen to only 36. In that year, George W. McCollom (1814–1878) of New York City, a rich man born on a farm near Mont Vernon, gave the school $10,000 (equivalent to $254,333 in 2023) in memory of his late wife, Mary Ann Stevens, a niece of William Appleton born in the town, and the school was renamed as the McCollom Institute. A colonnaded porch and porte-cochère were added to the school building, and by 1873/74, numbers were back up to 86, with an average student age of eighteen.^[1]

On 27 August 1872, a reunion of alumni was held at the school, including a dinner with speeches in the afternoon and a promenade concert in the evening, attended by George Stevens, described as the school's first principal, who presided; two other former principals, the Rev. Agustus Berry, who made a speech, and the Rev. C. F. P. Bancroft, who read a poem; the new principal, the Rev. W. H. Cutler, who made a speech; George A. Marden, an alumnus, who was toastmaster; George A. Ramsdell, a future governor of New Hampshire, who was appointed to a committee to arrange the next reunion; and many others.^[6]

In April 1879, the length of the fall and winter terms was fixed at thirteen weeks each, leaving the spring term at twelve weeks, which made the school year two weeks longer.^[7]

In 1892, with numbers falling again, one of the school's rooms was put into use as Mont Vernon's first public library.^[1]

In February 1895, a special meeting of the Trustees held in Boston decided to replace the then-schoolmaster, Professor J. B. Welch, with G. Wilbert Cox, a recent graduate of Harvard, and he stayed for three years, with his wife, Mrs. E. D. Cox, who also taught in the school. Cox left in 1898 to take up the post of Superintendent of Schools at Bellows Falls, Vermont. In September 1898 he was replaced by George S. Chapin, a graduate of Bowdoin who had been an assistant to Welch, and Chapin carried on teaching until the summer of 1899. There was no school from 1900 to 1901. In September 1901, the Rev. H. P. Peck, pastor of the Congregational church, was employed as principal, for five hundred dollars a year, but at the end of the year the trustees were concerned that this did not provide full high school privileges, so that parents could send their children to any high school in the state, and the town would have to pay for the tuition. Peck then continued as principal, with Miss Annie Louise Williams, a graduate of Brown University, as his assistant. She resigned in 1903 to take a position in the high school at Whitefield, New Hampshire. In September 1903, Professor Leslie A. Bailey and his wife were then hired as principal and assistant, but they stayed only one year, resigning to move to a school in Maine. For the next two years, 1904–06, Henry W. Delano, a Dartmouth graduate, was principal, with Dr Clarence H. Hallowell as his assistant. Hallowell left in January 1906, and was replaced by Miss Annie Hazeu, an advanced pupil. However, by now the number of students had fallen to only eleven, and the trustees took the decision to discontinue the school.^[8] A local source states that the building was used as a public high school in its final years.^[9]

The book History of Mont Vernon (1907), says:

For some years the permanent population of the town had been diminishing, and the surrounding towns, also growing smaller, were sending their children to High schools in towns which were large enough to support them. The regular fitting schools had, by their superior advantages, drawn many of the class that formerly came to Mont Vernon, and McCollom Institute could no longer compete in the work.^[8]

After the end of the McCollom Institute, its trustees treated the school's building and remaining investments as educational resources.^[1] In September 1906, Arthur Stearns, principal of a boys' school in New Jersey, reopened the McCollom Building as a boarding preparatory school for boys and girls called the Stearns School. However, from 1910 no further girls were accepted. Needing other buildings and owning a golf course, this was a success until the crash of 1929. It closed in 1937, and for ten years the McCollom Building saw little use. In 1947 it became an overflow for the Central District elementary school, with the upstairs hall used as a gym until 1961, when it was divided into classrooms. In 1990 the classes finished moving to a site on Harwood Road, and the McCollom trustees gave the building to the town to be used for offices.^[9] In 2010, it was housing the Mont Vernon police department and also the town clerk.^[1]

Until at least the 1940s, the McCollom trustees helped to fund local students going to colleges and universities.^[1]

• George Ashley Campbell (1870–1954), engineer^[10]
• George A. Marden (1839–1906), journalist, attorney, and politician, Massachusetts Treasurer^[6]
• George A. Ramsdell (1834–1900), lawyer and politician, Governor of New Hampshire 1897–1899^[6][11]

42°53′36″N 71°40′24″W / 42.89333°N 71.67333°W / 42.89333; -71.67333