PX VITI. 
. Agate. 
. Plagioclase and Orthoclase Felspars 
. Microcline and Hornblende . 
. Augite. Biotite. 
. Serpentine and Chrysotile 
. Structures in Glassy Rocks 
. Glassy Rocks. 
. Porphyritic Structure, Quartz-Porphyry 
. Graphic Granite. 
. Porphyritic Structure. 
. Spherulitic and banded Obsidian 
. Orbicular Diorite (Corsite, Napoleonite) 
LIST OF [ILLUSTRATIONS 
PULL-PAGE PLA LES 
Rock-crystal with Rutile. Garnet . 
Sphene. 
. Olivine and Chiastolite 
Structures 
. Granophyre. Calcite. Trachytic Structure 
Druse in Granite. 
Granitoid Structure. 
. Volcanic Tuff and Veins of Calcite 
XVI. 
XVII. 
XVIII. 
XIX. 
TOS, 
XXI. 
XXII. 
XXIII. 
XXIV. 
XXV. 
XXVI. 
XXVII. 
Scorize or Volcanic Cinders 
Volcanic Bombs 
Section of Volcanic Bomb 
Stalagmite, Gibraltar . 
Volcanic Tuff. Shelly Limestone 
Biotite Gneiss. 
Spotted Slate. 
Gneiss with Phacoids. 
Schistose Conglomerate 
Gneiss 
Diagonal Bedding in Sandstone, Arran 
Rill-marks and Current-marks 
Casts of Sun-cracks (Sandstone) 
Septarian Nodule. Ferruginous Con- 
cretions 
Dendritic Markings 
XV 
3 
Corroded Quartz 
To face p. 1 
and 9 
To face p. 
>p) >) 
> i Between pp. 
=e, 
Pegmatitic and Ophitic 
and 25 
To face p. 
bb) 99 
-\ Between pp. 
i 
and 41 
To face p. 
99 39 
99 9 
. \ Between pp. 
ue) 
and 57 
Lo face p. 
rp) oP) 
-\ Between pp. 
os 
and 73 
To face p. 
and 121 
Between pp. 8 
16 
17 
24 
118 
| Between pp. 120 
i 
A 
