46 The American Geologist. July, 1897 
10. These isolated masses are both fine and coarse grained, 
sometimes very quartzose. 
11. There are very coarse pegmatyte veins, the orthoclase 
crystals being two or three, or even six inches on a cleavage 
surface, but these veins are usually in openings in the schist 
which are transverse to the prevalent structure. 
12. There are numerous segregations that consist partl}'^ of 
quartz and partly of a mixture of quartz and feldspar, the 
latter having some dark ferro-magnesian mineral in small 
amount. In some cases the feldspar and quartz surround a 
quartz nodule, and, vice vema, sometimes the quartz surrounds 
the mixed segregation. They must necessarily have had the 
same origin. 
13. Sometimes over large areas of the hard schist there ap- 
pears to have been generated a fine feldspar. The rock is 
still gray and schistose, but coarser and granular, and weath- 
ers red. This is a rock intermediate between granite (or 
gneiss) and mica schist. 
14. There is a hardening and crystallizing apparent, in 
some places, in all the schist, rendering it all susceptible to 
the name gneiss, but it is gray except on weathered surfaces, 
which become red, and on the parts which are of real 
granite. 
Other characters were noted, but need not be mentioned. 
After considerable study as to the probable manner of origin, 
of this granite, I finally concluded that it is segregated cheni- 
icall}'-, and was not molten. That the schists were fractured 
at about the same time that this segregation took place, is 
evident, but at this place the filling of these openings was ac- 
complished mainly by chemical and hydro-thermal transfusion. 
There may have been actual fusion by hydro-thermal forces, 
at some short distance from the points at which the inspection 
was made, and some of the fused rock may have entered some 
of the adjacent openings in the schist, but if it did the resul- 
tant rock is so nearlj'^ the same as that which has been gene- 
rated in situ that it can scarcely be distinguished from it. 
"We have then, here, the conversion of the crystalline schist 
into gneiss, in situ, near the boundary of a great granitic 
boss. We have the generation of isolated granitic nodules in 
the schist, some of them being identical with the granite of 
