《胡适全集》第23卷收录了胡适1929年以前的中文书信,其中部分书信书写时间不明。因赖以判断的线索太少,编者未能尽可能地确定或接近它们的书写时间,以致这些书信成为时间不明之疑信,妨碍学术界对它们的准确利用,亟待逐一厘清。 The Complete Works of Hu Shih vol.23 contains Chinese correspondence written by Hu Shi before 1929. Some of them were written in unknown time. Due to too few clues to judge, editors fail to determine or approach their writing time as much as possible, so that these letters become doubtful information of time, hinder the accurate use of the academic circles for them, need to be clarified one by one.