Is 'Map 33 shows the distribution of child (most of southern England) and of bairn (north of a slightly wavy line between Boston, on the Wash to the east, and Lancaster, on the west coast).' a fitting logical lead-up to 'Bairn was the pre-eminent word in the North of England.'
Map 33 shows the distribution of child (most of southern England) and of bairn (north of a slightly wavy line between Boston, on the Wash to the east, and Lancaster, on the west coast).###Bairn was the pre-eminent word in the North of England.