Hi Dickie,
I suppose you have found the death of Thomas Dickson, 38yrs, Farmer, died 15 Aug 1876, Westmeath, of cholera morbus, 4 days; father, James Dickson, senior.
Thomas married Jane Davidson, 1866, Westmeath.
There was a Thomas Dickson chr 1773, Whitsome. Parent: George Dickson [probably leading you on a wild goose chase!!!!!!!]
So far that is all I have been able to find and I am sure that this isn't what you are looking for.
Rae