 He partnered with their son, Thomas Underwood (also a tanner) who had become a beekeeper from 1853 to 1859 with up to 1200 colonies.Thomas invented a movable honey frame known as the Leaf or Underhill hive.He reduced the number of hives in 1862, probably due to the shortage of labor caused by the Civil War as well as the departure of his business partner Thomas in 1859 for Williamsport, PA to develop his tanning business.