Natives of Dundee are called Dundonians and are often recognisable by their distinctive dialect of Scots as well as their accent, which most noticeably substitutes the monophthong /ɛ/ (pronounced "eh") in place of the diphthong /aj/ (pronounced "ai"). Dundee, and Scotland more generally, saw rapid population increase at end of the 18th and beginning of the 19th century, with the city's population increasing from 12,400 in 1751 to 30,500 in 1821. Of particular significance was an influx of Irish workers in the early to mid-19th century, attracted by the prospect of employment in the textiles industries. In 1851, 18.9% of people living in Dundee were of Irish birth.