3o8 TJic Aiiherican Geologist. November, 18P8 
mesh of secondarx feldspar and quartz resembling the sur- 
rounding matrix, are by nietamorphism regenerated by new 
borders, and by micro-granitic growths of coarser grain, and 
by these new growths interlock about their margins. Occa- 
sionally the old feldspars embrace and surround idiomorphic 
small crystals of augite, having taken that relation in the 
magma in which they were generated, but the later feldspars 
do not enclose augite in that way. When the fragmental 
augites are not altered to hornblende, which alteration is usual 
they are simply embraced between the newly developed feld- 
spars. The old feldspars, thus contrasted with the new, can 
be distinguished with more or less certainty in nearly every 
section examined. 
Again, in the midst of the sedimentary schist are found 
coarser, hardened beds that present as compact and crystalline 
a texture as some of the intrusive granite. Such recrystal- 
lized beds are associated conformably with others that are 
not so hardened, the regular sedimentary relation and struc- 
ture being continuous through them all. This hardening and 
recrystallization of the schist evidently is irregular in distri- 
bution. Throughout the schist, even in its least metamorphic 
conditions, there is a fine background of micro-granulitic 
quartz, or quartz and feldspar, which is ready, in case of the 
application of new forces, to take on new forms. The back- 
ground matrix, in the porphyry as in the granite, is the same, 
fine interlocked quartz, or quartz and feldspar. In the por- 
phyry it seems to be a micro-granulitized feldspathic debris, 
for numerous feldspars can be seen, partially changed to 
such a micro-granulitized condition. 
It is, however, with the conglomeratic condition of the 
sedimentaries that the most evident transitions occur to the 
granite. These are conspicuous in the field, and with the mi- 
croscope the finer elements are seen to be simply compacted 
together with but slight interstitial material. The crystals 
all being, as supposed, of the nature of volcanic ejecta ar- 
ranged somewhat by water, the elements of the rock embrace 
these with small amounts of erosion products, the latter in- 
creasing with distance from the supposed volcanic source. 
One of the most evident and instructive instances of granitized 
conglomerate is that seen along the south shore of the lake 
