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Skip to 0 minutes and 3 seconds Next let us look at detchōsō (“pasted-leaf”) binding. The leaves are joined together with glue, as with scrolls, but the area where the glue is applied is different. Each leaf is first folded in two and pasted to the next leaf near the crease. When you look at it from the side the shape of each leaf resembles a “y”. The area where the glue is applied is called norishiro. The inner side of each folded leaf opens completely, but the outer side which is connected to the next leaf only opens up to the glued part. Then again there is a leaf that opens up completely followed by one ―the glue has come off here―that only opens partially.

Skip to 0 minutes and 55 seconds This alternating of fully opening and partially opening two-page spreads is the distinctive characteristic of the detchōsō binding. In terms of structure and how you turn the pages, it is very similar to modern books and in fact it is considered the oldest type of book-style binding. However, one shortcoming is that, as you have just seen, the glue tends to come off easily causing the pages to fall apart. Another major defect is that―please look at this―this is a very old example of detchōsō binding, as you can see, there are many small holes. They are especially numerous in this area here. What these are is wormholes made by insects that feed on paper.

Skip to 1 minute and 54 seconds Insects that feed of paper are called shimi in Japanese, but here the culprit is not shimi. A family of insects called shibamushi or shibanmushi (Anobiidae) which have a hard shell and resemble the rhinoceros beetle lay their eggs on the paper and the small larvae then feed on the paper to grow. They don’t dislike paper but their favorite target is the glued area, which is the most nutritious. Therefore, this is the most easily damaged part. And of course, when this part is damaged, the entire book falls apart like this. So this type of binding presents a number of major flaws. Which is why starting from around the 13th century, it gradually fell into disuse.

Skip to 3 minutes and 1 second Having said that, the famous monk Kūkai used the detchōsō format for the Sanjujō sasshi (the Thirty Books), the set of latest Buddhist scriptures that he brought back from China and which are now designated a National Treasure. In books brought to Japan from China ―this has to do with the type of paper― there is writing only on the inner side of each folded leaf and the pasted side is left blank. Detchōsō books made in Japan, however, usually have writing on both sides of the leaf. Because of Kūkai’s legacy, the detchōsō format continued to be used within the Shingon sect of Buddhism up until the modern period, so long after everybody else had stopped using it.

Skip to 4 minutes and 9 seconds And here I conclude my explanation of pasted-leaf binding.

基本的な装訂の種類3 -粘葉装

このステップでは、粘葉装(でっちょうそう)について学んでいきます。以下のテキストを読んだ後、佐々木教授のお話をビデオでご覧ください。

3. 粘葉装(でっちょうそう)

Detchoso (oriental style binding) 図1. 粘葉装(でっちょうそう)(単位:帖)

紙を縦に二つ折りしたものを重ねて揃え、重なる紙の折り目近くを糊で貼り合わせ表紙を付した装訂法で、折り目の箇所と貼られた箇所では開き方に差がでるのが特徴です。806年に僧空海が中国より持ち帰った『三十帖冊子(さんじゅうじょうさっし)』と呼ばれる書物群がこの装訂であり、冊子体として最も古い装訂であると考えられています。

Jokan Seiyo 図2. 貞観政要
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糊付け部分が剥がれやすく、また虫にも食われやすいのが最大の欠点(図2)で、鎌倉時代になる13世紀以降はあまり使用されなくなりました(図3)が、仏教関係書、特に空海が宗祖となった真言宗のみは近代に至るまで使用され続けました。数え方の単位は折本と同じく「帖(じょう)」を用います。

Hokekyō tanji 図3. 法華経単字
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古書から読み解く日本の文化: 和本の世界

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