Abstract
The appearance of reliable new materials is expected to give past research new results. However, contrary to expectations, this is not necessarily so. This thesis discusses the kana prose works of the latter Heian Period. The main purpose of this research is to find new subjects for materials research through explaining mistakes in previous research. This thesis submits a new point of view from both the viewpoint of language study and the viewpoint of literary research through pointing out the following two facts. First, this thesis proves that in the Heian Period there was a single word(hituide) that certainly had the meaning of "the fortune of the calendar day". This is confirmed by investigation of various materials relating to the study of Japanese. This thesis then demands modification of previous materials research. This thesis further demands revisions of descriptions contained in various dictionaries such as Nihon Kokugo Daiziten, Kozien etc. Secondly, this thesis explains the fact that the body of Sizyonomiya Simotuke Syu(四条宮下野集) where it defines tasoni(誰そに) is taken as one instance of a misinterpretation that has existed for a long time, and confirms interpretations that tauni(答に) should be decided from examination in the study of Japanese research. This thesis then requires significant modification of our understanding with regard to the context of the body concerned, the theme and previous literary interpretation.
