Carrington H. Lake, « Pond Life in Midwinter », Science Gossip, Londres, 1883, p. 63-64.

While alluding to the caddis-worm, I should like to correct the eroneous notion which Mr Ollard, of Enfield, gave expression to in the May number of Science-Gossip. He asked if any one could tell how it was the bits of weeds, grass, &., out of which caddis-worms make their cases kept their natural state so long as the insects required their use. But it is not true that the materials used do retain their «  natural state » so long as the caddis-worm inhabits them. Many of the caddis I have taken this year have been enclosed in cases which have lost all their greenness.