Scope and Contents Letter to Sir Charles Lyell from William Baird relating to Helix Tiarella which was published by Webb & Bartholet in 1833. He tells Lyell that no further mention was made of it in their synopsis except that it was obtained from a bag of Orchil. He advises Lyell that is would not be necessary to go to Madeira for a sample as it is readily available in the Canary Islands where it forms the major export and fetches twice as much as Madeira orchil on the London...