It is well known in England for its graceful habit, the slender, grey - or white - barked stem, the delicate, drooping branches and the quivering leaves, a bright, clear green in s p r i n g, becoming duller in the summer, but often keeping their greenness rather late into the 5 autumn.
Such twins may therefore be mistaken for simple crystals unless they are attentively studied; but the twinning is often made evident by the presence of irregularly bounded areas of the duller z faces coinciding with the brighter r faces.
The resulting surface is usually duller and less lustrous than that obtained by the use of molten zinc. Another method of forming a coating of zinc, known as sherardizing, was invented by Sherard CowperColes, who found that metals embedded in zinc dust (a product obtained in zinc manufacture and c
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