Page:A Book of the West (vol. 2).djvu/314

246 the first place the serpentine rock that forms it, and then the plants which luxuriate on the serpentine.

The serpentine lies to the west, reared up in the magnificent cliffs of Mullion and Kynance coves, but the main body of the upheaved plateau consists of another volcanic rock called gabbro. The serpentine is so called because it has something of the glaze and greenness of a snake's skin.

The Lizard rocks have long been an object of interest and dispute among geologists. For a study of them I must refer to the papers of Mr. T. Clark in the Transactions of the Polytechnic Institution of Cornwall.

The most casual visitor must be struck, if in Meneage at the season of flowering, with the abundance of the beautiful Cornish heath {Erica vagans), which in growth and general appearance cannot for a moment be mistaken for the common heath. The Rev. C. A. Johns says of it in his Week at the Lizard:—

"The stems are much branched, and in the upper parts very leafy, from two to four feet high. The flowers are light purple, rose-coloured, or pure white. In the purple variety the anthers are dark purple; in the white, bright red; and in all cases they form a ring outside the corolla until they have shed their pollen, when they droop to the sides. On the Goonhilley Downs in Cornwall these varieties of heath grow together in the greatest profusion, covering many hundreds of acres, and almost excluding the two species so common elsewhere."

It flowers from July to September.