If you have Irish ancestors or helping someone in your ward who does, these Tithe Apploments might help them answer some questions. Following is an explanation of these books from the Ireland National Archives.
The Tithe Applotment Books are a vital source for genealogical research for the pre-Famine period of Ireland, given the loss of the 1821-51 Census records. They were compiled between 1823 and 1837 in order to determine the amount which occupiers of agricultural holdings over one acre should pay in tithes to the Church of Ireland (the main Protestant church and the church established by the State until its dis-establishment in 1871).
There is a manuscript book for almost every civil (Church of Ireland) parish in the country giving the names of occupiers of each townland, the amount of land held and the sums to be paid in tithes. Because the tithes were levied on agricultural land, urban areas are not included. Unfortunately, the books provide only the names of heads of family, not other family member
FamilySearch.org has images of these Applotment books as well as the National Archives of Ireland which I have featured in the Internet section this week.
To find this database on Familysearch.org, click on the Search button in the middle of the page, Scroll down to the bottom of the page and on the left hand side click on United Kingdom and Ireland. Next, click on Ireland(8) in the left hand column. You will see the Ireland Tithe Applotments books on the right hand side. Click on this and begin searching for your ancestors. Try searching on just the last name if you donít have any luck.
Let me know if you need help.