.. J. D. Dana—Geology of Westchester County, N.Y. 315 
(3) The increase in the grade of metamorphism, sufficient 
moistur re being present, would have needed no other cause but an 
consist only of the common ingredients of sediments, and increase 
or abundance of garnets means little more than increase in amount 
ays 
(4) Staurolite and fibrolite are minerals that occur widely 
distributed through mica schists ; and require for their formation, 
not contact-conditions, but too ‘little alkali. with Mg silica and 
alumina in the original bed-material to make a feldspa 
hatever, then, the origin of the granite, the Ber must have 
been put into its present “flexed condition before there was any 
and are well explained on the view ultaneous metamorphic 
changes in two adjoining conformable eayarnerse ary virilecseve — 
cet some intermediate gradations an calations, in whic 
p ints seem 
theory of direct eruptive wae ‘it beer pata eat with those of 
to the same conclusion—that of a metamorphic origin alike for 
the soda-granite, quartz-dioryte, noryte and chrysolitic ke If 
there has ever been an example of an igneous rock made through 
the fusion of sedimentary beds, the cases —. described may be 
reasonably regarded as of this mode of ori 
‘or the remainder of this Appendix see the supplementary 
sheet at the close of this number, p. 327. 
* One of the statements on pose - tet the article referred to I ee to with- 
draw—that relatin ing . nS The e is correct as far so it goes: but I have 
found, on a recent visit to the clase: that —— band is continued after another 
fault, and is not a canner one folded on itself. 
