246 MINERALOGY AND LITHOLOGY. 
Fig. 6. A section of the Troy granite, in polarized light, showing a grain of mi- 
crocline and the characteristics of the minerals which compose the 
Concord group of granites—page 195. x 50 
PLATE XI. 
Fig. 1. A section of the easily disintegrating Conway granite—page I95. X 30 
Fig. 2. A section of the Antrim granite, showing the appearance of the garnets 
which are commonly found in the granites—page 197. X 30 
Fig. 3. A section of the Mt. Carrigain granite, showing the microscopic pegma- 
tite which characterizes it—page 2o1. x 200 
Fig. 4. Centre of a mica concretion in the pudding granite from Craftsbury, 
Vt.—page 203. x6 
Fig. 5. A section of augite sienite from Jackson, showing the process of forma- 
tion of uralite—page 205. X 50 
Fig. 6. A grain of titanic iron in a section of the augite sienite from Jackson— 
page 205. x 50 
(See, also, Fig. 1 on Pl. 7, which is a section of augite sienite from another lo- 
cality.) 
PLATE XII. 
Fig. 1. A grain of quartz in a section of sienite from Columbia. The quartz is 
in contact with a crystalline grain of calcium carbonate, and encloses 
a multitude of cavities, each of which is partially filled with liquid 
carbonic acid—page 207. X 350 
Fig. 2. A section of argillitic mica schist from Woodsville—page 219. x 600 
Fig. 3. A section of metamorphic diorite from Pittsburg—page 227. xX 50 
Fig. 4. A section of metamorphic quartz diorite from North Lisbon—page 229. x 50 
Fig. 5. A section of a half fragmental quartz from Newcastle—page 239. x 30 
Fig. 6. A section of the Connecticut red sandstone—a fragmental rock—page 
239. x 30 
