C. H. Hitchcock—Labradorite Rocks in New Hampshire. 45 
cealed, on account of the easily decomposing character of the 
labradorite. The first rock seen is a gneiss with nodular ortho- 
0° W 
clase, dipping by compass about 80°, S 7 . The strata are 
strata, cipHing E. 15° S. and EH. 85° N. The surface is almost 
* Proc. Amer. Acad. Sci., Philadelphia, 1860, p. 363. 
