The purpose of this study is to clarify the use of lime in joint mortar of masonry buildings in the Meiji era. Main results of this study are as follows. 1. Lime mortar was used in joint before Nobi earthquake, and cement was added in the important parts. Later, cement mortar that was added lime became general, and cement mortar was used in the important parts. 2. There were two kinds of slaked lime, one was powdery and another was pasty. 3. It is difficult to presume the mixing proportion of joint mortar if it was not specified whether lime was slaked.
