SO-CALLED PORPHVRITIC GNEISS OF NEW HAMPSHIRE 709 
ite on the island, very coarse pegmatitic dikes appear which are 
similar to the granite, and do not appear to belong to the class 
of pegmatite veins of segregational origin so common in the 
crystalline area of the state. 
About a mile and three-quarters from Weirs there is a small 
inlet, on the south side of which the porphyritic granite is in 
contact with a dark coarse-grained gneiss. This seems to be 
equivalent to the Lake Winnipiseogee gneiss. It is cut by an 
apophysis of the porphyritic granite, and a horse of the schist 
can be seen on the bare ledges enclosed within the other rock. 
Again, as on Governor’s Island, there is an apparent conformity 
of position. 
Just across Meredith Bay, on Spindle point, an interesting 
contact occurs. The porphyritic granite outcrops occasionally 
on and about the road from Meredith with pretty definite folia- 
tien, the strike varying from N. 20° Eto N..4o° E., the dip 
high, but changing from easterly to westerly in an irregular 
fashion. On the top of the hill at which the road ends, an 
solated mass of another rock is conspicuously displayed in the 
well-smoothed ledges. It is dikelike in its form, being fully 
four hundred yards long and from ten to twenty wide. There 
is a distinct schistosity with its planes parallel to the longer 
axis of the mass which strikes S. 4o° W. The dip is high 
at about 75° to the southeast, making an apparent conformity 
with the enclosing porphyritic granite, which is here well foli- 
ated. Within a distance of 300 yards south of this long band, 
and oriented with the longer axis parallel to it, smaller bodies 
of the same rock occur, again completely enclosed by porphy- 
ritic granite. They have the same pronounced structure-planes 
with a similar relation to the foliation of the country rock. 
From the hill top the largest of all these parallel bodies strikes 
toward a larger body of the same rock. Like the other, this 
mass is characterized by a strong gneissic structure. It also pos- 
sesses an elongated form. We have here to deal with a number 
of horses immersed in a once molten magma which chrystallized 
out as porphyritic granite. The patent differences of grain and 
