EXPLANATION OF PLATE III.

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MAGNIFIED SECTIONS OF VOLCANIC ROCKS.

1. Diorite dyke, traversing Assynt limestone, North Highlands.

2. Basalt from upper beds, near Giant's Causeway, County Antrim.

3. Hornblende-hypersthene-augite Andesite, from Pichupichu, Andes.

4. Augite-Andesite from Pichupichu, Andes.

5. Olivine dolerite, with hornblende and biotite, Madagascar.

6. Leucite basalt, with mellilite, Capo di Bove, Italy.

Plate IV.
Plate IV
                                                                                                                                                                                                                                                                                                           

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