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112 SERPENTINES OF THE AMERICAN CONTINENT. offering any opinion on this question of structural affinity, T only venture to state that, as all great masses of marine limestone, even from the earliest geological ages, must be regarded as of organic origin, it is not improbable that some traces of their struc ture may have been retained, even in rocks which have undergone some amount of metamorphism, such as the eozonal serpentines of Canada. A fine block of this serpentine with polished surface, is now in the gallery of the Museum of Practical Geology, London. In the Quebec group, serpentinous rocks are still more abundant, of darker colour, tougher, and better suited for ornamental purposes. They seem to be the product of metamorphism from dolomites, and are widely distributed in Eastern Canada, as at Melbourne, Orford, Saint Joseph, Mount Albert, and Stukely. The serpentines of Roxbury, and Cavendish at Vermont, resemble those of Italy, and are largely employed for ornamental purposes. 1 Newfoundland. A mountain between 2000 and 3000 feet in height, composed of serpentine, rises near South Arm, in a district formed of metamorphic rocks. 2 United States. Good serpentine is found at Phillips- town, Port Henry, Gouverneur, and Warwick in N. Y., Newburyport, Westfield, and Blanford, in Mass.; at 1 Logan, Geology of Canada, p. 821. 2 Ibid. p. 820.