Feltham Urban District grounds of St Mary's Church, Bedfont, which are accepted as local emblems. The winged sword stands for London Airport and the district's close association with the aircraft industry. The sword also refers to the Royal Army Ordnance Depot, and to the ancient sword-mill marked on a 17th-century map. The gunstones also allude to the R.A.O.C. Depot, and to the powder mills which formerly existed in the Crane Valley. The hawthorn refers to the Spelthorne Hundred, and the eagle is a reference not only of air traffic, but also of the Roman-founded London to Bath (Aquae Sulis) and Calleva Atrebatum (town
Aphanizomenon flos-aquae toxic chemicals released when cells die. Once released (lysed), and ingested, these toxins can damage liver and nerve tissues in mammals. In areas where water quality is not closely monitored, the World Health Organization has assessed toxic algae as a health risk, citing the production of anatoxin-a, saxitoxins, and cylindrospermopsin. Dogs have been reported to have become ill or have fatal reactions after swimming in rivers and lakes containing toxic "A. flos-aquae". Microcystin toxin has been found in all 16 samples of "A. flos-aquae" products sold as food supplements in Germany and Switzerland, originating from Lake Klamath: 10 of 16