Unfortunately townlands were frequently unspecified in the 1740 Protestant Householder Rolls, but there are two Tracys in the parish of Artrea; likely one was in Ballyneill Beg. The 1766 Religious Census, though, is a boon; we count 56 head of households, 17 Established Church and 39 Catholics (papists); remarkably, there were no dissenters recorded. I will have more about correlating the 1766 Religious Census with the 1831 Census and the 1858 Griffith Valuation, since we have names; we may be able to get a better idea of where exactly John Harbison lived.
Anyway, to conclude our stroll down demographic lane, in the 1831 census, there were 39 households in Ballyneill Beg, 11 Established Church, 24 Catholic, and 4 Presbyterian (yay dissenters!), for a total count of 61 Established Church, 126 Catholics, and 21 Presbyterians, or 208 individuals on 480.49 acres, a density of one person per 2.31 acres.
There were 47 households in Ballyneill More, 19 Established Church, 24 Catholic, and 4 Presbyterian, for a total count in both townlands of 86 households. In Ballyneill More, there were 113 Established Church, 134 Catholics, and 21 Presbyterians, or 268 individuals, on 632.78 acres; a density of one person per 2.36 acres. This is an unsustainable density in a rural area, and directly led to the Great Famine of 1845-1848.