To be sure, many Japanese dictionaries have appeared in the world before now. Of these, however, it may be said that they are deficient either in that they provide the "koe" reading of characters, omitting the "yomi" reading, or that they record the "yomi" and ignore the "koe". Herein we propose to assemble "left-over ["rakusaku"]" "kanji" and compounds long in use but hitherto overlooked and to arrange them, after the manner of the "Irohashu", in "iroha" order, their "on" readings to be on the right and their "yomi" to be on the left, and thus to produce in one volume a dictionary to be designated the "Rakuyōshū". Thereafter we propose to add a section of characters and compounds similarly grouped in "iroha" order but arranged in terms of their Japanese readings. (tr. Bailey 1960:297)