Conglomerates with Gneiss, Talcose Schists, G-c. 385 
mountain chain, wot make the horizontal elongation in some 
-places the ereates 
e do not es that this explanation of the pore saps = 
the true one, but only that it shows one mode in which the 
cess might hay e been performed. Whether any horizontal hex. 
ure can be Sante n the Rhode Island rock to explain the elon- 
gation there, we are unable to say, because the theory was not 
In 7 minds when we examined those rocks. 
. The facts detailed, disclose to us some of the modes in 
that we cannot doubt but both een from the same parent 
source. But the conglomerate at Wallingford affords still 
. Stronger evidence and shows us the modes in which the gneiss 
was produced from the conglomerate. Some of the elongated * 
pebbles there are gneiss. But we doubt 2 i they a 
who has seen the specimens will imagine that it could have po 
introduced mechanically, by deposition, for example. The last 
ways or crysta]lization from solution, is the only other probable 
mneiss, perhaps, has been ane formed by such an 
now that we know how to look for them. tune , some varieties 
of it contain nodular elongated masses of feldspar interlaminated 
with mica which may perhaps have been originally pebbles 
chemically changed and elongated mechanically. 
The second agency by which condleiserita has been converted 
into schists, is mechanical. By some force they have been flat- 
tened and elongated till they have become the quartzose laminz of 
the schists. It is not probably possible for us to convey a very 
clear and complete idea of the evidence of this position. ul 
that our readers could, as we have done, visit the localities again 
and again and become familiar with the striking specimens there, 
by ul examination. From our own experience, 
it would not surprise us, if the conversion of the pebbles of con- 
