I found this on the Waterford County Library website in the death registers of the family history section. Date of death 11th March 1868, place Castle Street, name Cornelius Sargint, age, 11 months old, rank carpenters child, tabes, influenza, informant Mary Tracy, qualification present at death, district, Cappoquin. There are other Sargints, Sargents in the index of the death registers.