History of Scottish Gaelic
All surviving dialects are Highland and/or Hebridean dialects. Dialects of Lowland Gaelic have become defunct since the demise of Galwegian Gaelic, originally spoken in Galloway, which seems to have been the last Lowland dialect and which survived into the Modern Period. By the 18th century Lowland Gaelic had been largely replaced by Lowland Scots across much of Lowland Scotland. According to a reference in "The Carrick Covenanters " by James Crichton, the last place in the Lowlands where Scottish Gaelic was still spoken was the village of Barr in Carrick: only a few miles inland to the east of Girvan, but at one time very isolated. Crichton gives neither date nor details.
Callander
Scottish Gaelic was once widely spoken. In 1803, William Wordsworth and his sister, Dorothy, visited Callander and the Trossachs and recorded everyday encounters with Gaelic language and culture. In the 1840s sermons were delivered in both Gaelic and English, and Gaelic was taught in at least two schools in the area. By the 1880s most locals were speaking a mixture of Gaelic, Scots and English. In the 1900s, Celtic scholar, William J. Watson, documented, "four Gaelic-speaking men born near Callander, two of whom were over 80 and had excellent knowledge of the place-names." However, one 19th century writer (Alexander MacGibbon) took objection to the local dialect, stating, "The true Gaelic is a noble language, worthy of the fire of Ossian, and wonderfully adapted to the genius of a warlike nation; but the contemptible language of the people about Callander, and to the east, is quite incapable of communicating a noble idea."