John Christian Freund, The Dark Blue, vol. 1, Londres, Sampson Low, son, and Marston, 1871, p. 702

Within this little pond are many species of caddis and several of May-flies-at least, of these insects in the preparatory condition. A really good collection of caddis-tubes can be procured from this spot, and I was rather surprised to find in ir curved and conical tubes of Sericostoma, which are made of sand and tiny fragments of stones.