Hi Kate, William Furlong, James' father, died in Fitchburg, 14-Feb-1865, age 60 of "old age". No parents are listed.Location of birth is merely given as Ireland. I was in Fitchburg some years ago doing research in the vital records office and came across this as I was hunting for my ancestors.I recorded all the Furlong surnames I found.
Hope this helps.
Also, James Furlong naturaliztion cert # is 4-191 if that helps you.If he was naturalized in 1852, I'm guessing he had to be "in country" for a few years, possibly 3 or 4, to file his initally papers, establish residency and secure employment.On the 1850 census, James is living in a company-owned boarding house, hence his arrival on or before 1850.