Bitumen

inflammability and strong odour. The name is sometimes used to include Mineral Resins, such as naphtha, petroleum, mineral pitch, asphalt, mineral caoutchouc, etc. Of these resins the last named is the most interesting. It is now called Elaterite, and it is only found in three places— (1) The Odin lead mine in Derby shire; (2) a coal mine at Montrelais, near Angers, in France; (3) a coal mine near South Bury in Ma achusetts. It is elastic and flexible, and may be used as a pencil-eraser.