The Notation of "daku-on" and "sei-on" in the Verses 904-906 of Man'yoshu

The notation of“Daku－on”and“Sei－on”in chapter 50f 1瞼ガyδ5厩（except verses 904－906）differs frQm that in the other chapters in the kind of characters used and their usage。 However， the use of characters for notation in the last three verses（904－906）is difFerent from that in the other ver『es of the same chapter， alld is similar to that of the other chapters of Man’yδ3厩 What does this phenomenon mean？ The notation of“Daku－on”and“Sei．on”in chapter 5（except 904－906）is similar to that of Koゴ弼． And we know that the notation system in Koj’iki is older thanルta nン o’sh zi（except chapter 5）， because in、Koブ海there is a clear distinction of the usage of‘ルto characters in the Ancient Special Kana．orthography． Therefore， it can be inferred that the notation h chapter 5（except 904－906）is， like that of K（）」°iki， based on a system earlier than the one in the other chapters． On the contrary， we cannot且nd this older kind of notatio且in the Iast three verses． Moreover， the notation of these thr6e verses is similar to that in the other chapters（except chapter 5）． This suggests that the notation system in these verses is Ilewer than that used in the rest of chapter 5． Iconclude therefore that these three verses had been added to the fifth chapter in later times