In 1804, at age 71, he wrote drafts of 'Koganeisago' (or Kinsa, a commentary on Manyoshu) and 'Kinsa Jogen' (Additional documents of Kinsa); and the following year, 1805, he wrote a draft of 'The 72 Divisions of the Solar Year.'
1804年（文化(元号)元年）71歳、「金砂」（こがねいさご）（万葉集注釈）、「金砂剰言」、1805年、「七十二候」稿。