Conglomerates with Gneiss, Talcose Schists, §c. 389 
left the excess of silica in the form of quartz, and forced the 
feldspar and mica to fill up the interstices. The feldspar hen 
has converted the cement into gneiss, could have had no othe 
origin and this fact in connection with all the rest t which cowl 
been adduced, affords a presumption that feldspar in nearly all the 
ck deat rocks, stratified and unstratified, is a product of meta- 
— 
e bis 
ave specimens from Bernardston, Mass., in w which the bat we appa and 
flattening are decided in a conglomerate micaceous schist conneeted with 
clay slate and quartz rock. The same is true to some extent in a like 
rock from Bellingham, Mass. Still more decided is it in bowlders of 
the conglomerate-syenite described above from North Hampton; as it is 
also in the same variety of Ag on Little es rg Tn fact we predict 
oughly metamorphic ages aad although nt Tobed by observers, 
because their attention was not called to it. 
Less than a mile north of the i tei locality in Plymouth, Vt., 
on the east side of the pond, and nearly on the strike of the con nglome- 
rate, occurs a remarkable variety of ios Fa in an aewteatied bed sey- 
eral rods wide. It consists of a ground of dark limestone through which 
are nied numerous elongated masses from half an inch to six 
inches long, and from a quarter of an inch to an inch Sor of white, 
semicrystalline carbonate of lime. Their larger axes lie as nearly parallel 
to one another as those of the quartzose conglomerate. What their 
whether they are not masses elongated by the same force that has acted 
on the not far distant conglomerate. ‘This idea did not occur to me when 
in the vicinity, and therefore I did not go to determine the point 
there be any foundation for this sngyestion, we should expect that the 
longer axes of these nodules would correspond more nearly with the dip 
oa, with the strike. I have not the slightest recollection whether it 
The chief interest in the facts and conclusions in this pa 
lies in the light they cast upon metamorphism. We had in eed 
felt that there was a eed eal of gree: in the general doc- 
able men. But never 
ly under our eyes, and so Saye. as to confound our scepticism 
po 
sions have been the other way. But we rey ga resist evidence 
so clear, and we find that our new views greatly illustrate the 
subject of metamorphism. It seems to us difficult to conceive 
how geologists can avoid the conclusions we have presented, if 
