After over 2 years ive only just noticed this message!! Sorry!!
The children i have for Samuel Alger and Elizabeth Jacobs are Elizabeth (1835-1743), Samuel (b.1738 - my direct ancestor), Robert (1740-42), Mary (b. 1744), Elizabeth (b. 1744), Jemima (b. 1746)
I hope this is of some help.
If you still have the parish registers of Diss and if you are still prepared to do lookups and have the time, could you please look up the burials of Samuel Alger and Elizabeth Alger (nee Jacobs) - who both died somewhen after 1746 and also Samuel and Mary Alger - who both died somewhen after 1773.