Devil's Highway (Roman Britain) Devil's Highway (Roman Britain) The Devil's Highway was a Roman road in Britain connecting Londinium (London) to Pontes (Staines) and then Calleva Atrebatum (Silchester). The bridges at Pontes probably crossed Church Island. At Calleva, the road split into three routes continuing west: the Port Way to Sorviodunum (Old Sarum), Ermin Way to Glevum (Gloucester), and the road to Aquae Sulis (Bath). Its name probably derives from later ignorance of its origin and history, having been replaced for travellers by other roads nearby such as Nine Mile Ride, which runs parallel to the Roman road about a mile away but at
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