Sarah Louise Arnold &  Charles Benajah Gilbert, Stepping stones to litterature, New York, Silver, Burdett and Company, 1897, p. 214.

The fairies had washed him, you see, in the Swift river, so thoroughly that not only his dirt, but his whole husk and shell had been washed quite off him, and the pretty little real Tom was washed out of the inside of it, and swam away, as a caddis (1) does when its case of stones and silk is bored through, and away it goes on its back, paddling to the shore, there to split and fly away as a caperer, (2) on four fawn-colored wings, with long legs and horns.
(1) cad’-dis, a kind of fly that is hatched in the water.
(2) ca’-per-er, a kind of insect.