394 Scientific Intelligence. 
ence among the metamorphic rocks of New England soon satisfied 
me that the conclusion was wrong, and consequently, it is 
nowhere repeated in any of my later publicatior 
It is true Sees a schistose structure may be induséd by pres- 
sure. Bunt the question is—How far is this a fact in regions 0 
gneiss and Beane edded crystalline rocks. The following facts 
bear on the question. 
(1.) A dozen miles east of New Haven, Conn., at Stony Creek, 
a thick bed of rock varies laterally in the course of a few rods (as 
in many ot laces in the region) from granite to gneiss, and 
then, Hawes layers of the gneiss, there is a bed of black mica 
schist, made mostly of black mica or nee The beds are nearly 
horizon ae It looks like stratificati 
om five to nine miles west of New Haven, a fine-grained, 
garmetiferons mica schist is the surface rock. Going westward, it 
t bends in a synclinal as shown by the divergent dips; then a 
mile beyond, in an anticlinal (large granite veins Seats Be ae 
the axial region), and ends at Derby, where the dip is 90 
W. Beds of feebly crystalline limestone occur in this range of 
mica oe and show by their position, that a schistosity con- 
forms to the bedding. The garnets increase size westward 
from a diameter of yy in. to 4 in., and the sohtat hausties sone 
rently coarser, yet nowhere coarse, illustrating well one of the 
principles Hecbisaiwa b r, Lehmann—and by the Professors 
ogers, ceologists of Virginia and Pennsylvania, more than forty 
ate since. 
ioe the Shee becomes coarser to the westward and varies 
from common to porphyritic. Then follows, with perfect paral- 
lelism in bedding, a great formation of coarse gneiss, the most 
of the gneiss porphyritic, with the feldspar aes as large as 
the thumb b, and other portions of it coarsely micaceou 
The case looks sie one of stratification, of saccade deposits 
or strata, eis repeated ROD oecdittn at their Neca iste 
(3.) The gneiss Pat tion which commences at Derby continues 
westward with much mic ‘ae pen schistosity, and beget) dip— 
the dip indicating a synelinal at Derby. Three to six miles west 
of Derby it bends over ina very gentle gatatinat the eastward 
dip diminishing first to 20° and a to 10° and less, and the beds 
continuing nearly horizontal for more than eae miles, after which 
they pitch westward and so setitinie farther west. In the axial 
line limestone, one of them large, with gneiss in layers conform- 
ble to it above and below ; and to the south in the town of 
Trumbull, the limestone is 100 feet thiek, and some hornblendic 
schist in places adjoins it. 
. 
Here is haphorseipe eet! true stratification, the limestone stra 
tum setting a a ai occasion for doubt. Pressure bends and 
displaces pike: but ares not insert limestone beds, or make 
them out of gneiss, 
