It housed corpses until they started to decompose, so their graves would not be desecrated by resurrectionists and body-snatchers digging them up to sell the cadavers to medical colleges for dissection.
After the passage into law of the Anatomy Act 1832 Udny Mort House gradually fell into disuse; minutes of the committee responsible for its operation cease in about July 1836.
In the 18th and 19th centuries body-snatchers, also known as resurrectionists, shush-lifters or noddies, excavated graves to meet the increasing demand from medical colleges for bodies to dissect, as not enough were being supplied from executions.
Grave-robbing was a widespread problem and in 1821, the minister for West Calder, Reverend W. Fleming wrote:[1] Few burial grounds in Scotland, it is believed, have escaped the ravaging hands of resurrection men; and it is reported that with respect to a church-yard not far from Edinburgh, that, till within three years ago, when the inhabitants began to watch the graves, the persons interred did not remain in their graves above a night, and that these depredations were successfully carried on for nine successive winters.Bodies were securely kept in locked buildings until the process of natural decomposition rendered the cadavers useless for dissection.
[2] A group of 15 local gentlemen held a meeting in Udny Green on 21 January 1832 to discuss constructing a vault within the churchyard to hold dead bodies until they could be buried.
[3] Formally adopted the following week, an advertisement was placed in the Aberdeen Journal on 15 February 1832[4], inviting tenders for the construction of the mort house.
Four members of the committee were key bearers, and it was compulsory for them to be present to open and close the vault whenever necessary, although they were to be given twenty-four hours notice that they were required.
[3] The building was built from ashlar granite in 1832 to the design of John Marr of Cairnbrogie; the masonry work was undertaken by Alexander Wallace of Smiddyhill.