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DESCRIPTION OF THE FRONTISPIECE,

Pigs. 1 and 2. Iceland Spar. 3 4. Aragonite. 5 » 6. Titanite or Sphene. 7 8. Cyanide of Platinum and Barytes. 9

Quartz perpendicular to the Axis. 12. Airy's Spirals-right and left-handed Quartz superposed

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II

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