These data represent a portion of the morphological questionnaire returns collected for the Linguistic Survey of Scotland (Gaelic). The data have been transcribed and coded from questionnaire slips by Will Lamb. The file `stringdist-data.csv` contains the returns, retranscribed into a slightly modified version of Gaelic orthography (specifically, the orthographic device <t-s>, used to represent the replacement of initial /s/ by /t/ in certain morphological contexts, has been substituted for the spelling <t> to facilitate correct edit distance calculations). The file `master-data.csv` contains the coded data. The data have been analysed in terms of a number of features, coded as `1` (feature present), `0` (feature absent) or empty cell for no return. The file also contains metadata for individual points, such as their geographical coordinates, demographic information for the speaker, and demographic information related to the number of Gaelic speakers at the locality according to the 1891 census. The data is provided here as supplementary material to a paper, currently under submission, where the analysis is explained in more detail. `notebook.Rmd` contains an R notebook (also provided in compiled form as `notebook.nb.html`) to facilitate reproduction of the analysis in the paper. Data released under a CC-BY licence with permission from the School of Scottish Studies Archives, University of Edinburgh. The data stored in the `scotland.Rds` file (used for the production of maps) is derived from a shapefile with Scottish county boundaries provided by [A Vision of Britain](http://www.visionofbritain.org.uk). This work is based on data provided through [www.VisionofBritain.org.uk](http://www.visionofbritain.org.uk) and uses historical material which is copyright of the Great Britain Historical GIS Project and the University of Portsmouth. This work is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported Licence, <http://creativecommons.org/licenses/by-nc-sa/3.0>.