同図書館の書庫の大半は閉架で、見学者以外の一般人は立ち入る機会がない。

Most of the library’s stacks are closed to users, so ordinary members of the public other than visitors on tours rarely have an opportunity to enter them.

（注2）閉架：利用者に書棚を開放せず、請求に応じて本を取り出して見せるシステム

(Note 2) Closed stacks: a system in which users do not have direct access to the shelves and books are retrieved for them upon request

同図書館資料保存課の中島尚子さんは「室温25度、濃度60%で2週間燻蒸すると、成虫はもちろん、目に見えない卵まで駆除できます」と話す。

Nakajima Naoko-san of the library’s Preservation Division says, “If the materials are fumigated for two weeks at a room temperature of 25 degrees and a concentration of 60 percent, we can eliminate not only adult insects but even eggs invisible to the naked eye.”

これまで虫食い被害は数件しかなく、外部からの害虫の侵入はあまり警戒されてこなかったという。

Until then, there had been only a few cases of insect damage, so little attention had been paid to the possibility of pests entering from outside.

これまで虫食い被害は数件しかなく、外部からの害虫の侵入はあまり警戒されてこなかったという。

Until then, there had been only a few cases of insect damage, so little attention had been paid to the possibility of pests entering from outside.

これまで虫食い被害は数件しかなく、外部からの害虫の侵入はあまり警戒されてこなかったという。

Until then, there had been only a few cases of insect damage, so little attention had been paid to the possibility of pests entering from outside.

ところが、2006年に館内一斉調査をすると、過去に古書店から購入した和紙の巻物2本が、保管ケース内で繁殖した甲虫の一種「シバンムシ」の幼虫に食べられているのが見つかった。

However, during a library-wide inspection in 2006, two Japanese-paper scrolls previously purchased from a secondhand bookstore were found to have been eaten by larvae of a type of beetle called shibanmushi, which had multiplied inside their storage cases.

カビは本そのものを傷めるだけでなく、虫の餌にもなる。

Mold not only damages the books themselves but also serves as food for insects.

二酸化炭素は人や環境への影響も少なく、低費用で済む。

Carbon dioxide has little impact on people or the environment and is also inexpensive.

（朝日新聞2010年8月17日付夕刊による）

(From the August 17, 2010 evening edition of Asahi Shimbun)

段ボールの中身は、個人や団体が所蔵していた1930～40年代の和紙製の書籍や小冊子だ。

The boxes contained books and pamphlets made of Japanese paper from the 1930s and 1940s that had been owned by individuals and organizations.

同図書館資料保存課の中島尚子さんは「室温25度、濃度60%で2週間燻蒸すると、成虫はもちろん、目に見えない卵まで駆除できます」と話す。

Nakajima Naoko-san of the library’s Preservation Division says, “If the materials are fumigated for two weeks at a room temperature of 25 degrees and a concentration of 60 percent, we can eliminate not only adult insects but even eggs invisible to the naked eye.”

これまで虫食い被害は数件しかなく、外部からの害虫の侵入はあまり警戒されてこなかったという。

Until then, there had been only a few cases of insect damage, so little attention had been paid to the possibility of pests entering from outside.

同図書館資料保存課の中島尚子さんは「室温25度、濃度60%で2週間燻蒸すると、成虫はもちろん、目に見えない卵まで駆除できます」と話す。

Nakajima Naoko-san of the library’s Preservation Division says, “If the materials are fumigated for two weeks at a room temperature of 25 degrees and a concentration of 60 percent, we can eliminate not only adult insects but even eggs invisible to the naked eye.”

ところが、2006年に館内一斉調査をすると、過去に古書店から購入した和紙の巻物2本が、保管ケース内で繁殖した甲虫の一種「シバンムシ」の幼虫に食べられているのが見つかった。

However, during a library-wide inspection in 2006, two Japanese-paper scrolls previously purchased from a secondhand bookstore were found to have been eaten by larvae of a type of beetle called shibanmushi, which had multiplied inside their storage cases.

書庫に入れる前に、段ボールごと一斉駆除できるのが最大のメリットという。

Its greatest advantage is that the materials can be treated all at once while still in their cardboard boxes, before being placed in the stacks.