708 REGINALD ALDWORTH DALY 
the facts of field observation which have been adduced in con- 
nection with each of these formations. 
The porphyritic granite in contact with the Lake Winnipiseogee 
gneiss.—Close by Gilford Station, on Smith’s Neck, the bound- 
ary line of the porphyritic granite and the Winnipiseogee gneiss 
appears, and, so far as known, this is its most southerly exten- 
sion in this district. It is a typical acid biotite-gneiss at this 
place, elsewhere muscovite may be found. A few of the out-_ 
crops are significant. Here and there in the porphyritic granite 
masses of rock very similar to the main body of the schist occur 
in a horselike relation, although nowhere could the actual contact 
be found, and thus render possible a proof of that derivation of 
the masses. On Governor’s Island, two miles to the westward, 
a large outcropping of a coarse muscovite-biotite-gneiss occurs. 
This is a typical representative of the Lake Winnipiseogee gneiss, 
and this mass is completely surrounded by porphyritic granite 
for a distance of at least a quarter of a mile in all directions. 
About that distance from this outcrop of schist, the real contact 
of the porphyritic granite and Lake Winnipiseogee gneiss was 
found, and it became evident that in the first occurrence we had 
to deal with an outlier removed by some means from the parent 
schist terrane. This relation could hardly be explained except 
on a hypothesis of the igneous intrusion of the coarser rock in 
which the schist was enclosed as a great horse. The truth of 
this supposition was strengthened by the discovery of two marked 
apophyses of the porphyritic granite running into the inclusion. 
Returning to the molar contact, a corroboration of our conclusion 
from a study of the outlier appears in a clearly defined tongue 
of the porphyritic granite which can be traced for some dis- 
tance into the schist. Whereas on Smith’s Neck the porphyritic 
granite was largely granitic, here a well-defined foliation char- 
acterizes the rock. The strike of the foliation planes is N. 3° E., 
and the dip is 82° to the east. It is noteworthy that the strike 
and dip of the schistosity in the adjacent schist is the same. In 
other words, there is an apparent conformity between them. At 
several places among the numerous outcrops of porphyritic gran- 
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