在张树年先生与张人凤兄处,见到一封张元济先生于1931年7月为郑振铎先生写的介绍信。研读之下,深感这是一件难得的蕴有丰富信息的文献史料。今将自己的一点体会写出来。这封信很有点特别。用的是印有“涵芬楼制”的八行直栏旧式信笺,原文是用打字机竖打的,其上又有张元济用毛笔加的批注,但无署名。原文无标点,又用旧格式转行顶格。今试加标点,并改成现时通行格式,抄录如下。沅叔先生道席: At the meeting between Mr. Zhang Shurin and Mr. Zhang Renfeng, a letter of introduction written by Mr. Zhang Yuanji for Mr. Zheng Zhenduo in July 1931 was presented. Under study, I feel deeply that this is a rare historical material with abundant information. Write your own experience today. This letter is a bit special. Using the old letterhead with eight columns of lines printed with “Han Fen House System”. The original was typed with a vertical typewriter, and there was another note by Zhang Yuanji with a brush plus no signature. The original no punctuation, but also with the old format switch to the top grid. Try adding punctuation, and change the current format, copy as follows. Mr. Yuan Shu Road seats: