Perhaps the first detailed description of what is now known as Lyme disease appeared in the writings of John Walker after a visit to the island of Jura (Deer Island) off the west coast of Scotland in 1764. He gives a good description both of the symptoms of Lyme disease (with "exquisite pain the interior parts of the limbs") and of the tick vector itself, which he describes as a "worm" with a body which is "of a reddish color and of a compressed shape with a row of feet on each side" that "penetrates the skin". Many people from this area of Great Britain emigrated to North America between 1717 and the end of the 18th century.