John Clegg, The Secret World of the Pond, The Project Club, Project Book 013, Londres, Wolfe Publishing, 1970, pp. 38-39.
Archives du mot-clé glass beads
Beads
Url Lanham, The insects, New York, Columbia University Press, 1964, pp. 216-218.
Put in a jar
Millicent E. Selsam, Underwater Zoos, New York, William Morrow & Company, 1961.
Decorative results
Henry Williamson, Nature in Britain, article Pond and Stream Life de E.G. Boulenger, Londres, Batsford, 1936, p. 125.
If no other material is at hand
E.G. Boulenger, Richard St. Barbe Baker, L.C. Bushby etc., Nature in Britain: An illustrated Survey, Londres, Batsford T., 1936, p. 125.
In a saucer
Gregory C. Bateman, Fresh-Water Aquaria: their Construction, Arrangement, and Management, Londres, L. Upton Gill, 1892, p. 274-279.
Putting it into a vessel
Adolphe Boucard,A Manual of Natural History, London, Thomas Murby, 1876, p. 134.