104 J. D. Dana—Address of T. Sterry Hunt. 
my Manual of Geology published in 1863.—Mr. Hunt's reply 
to this is simply that I once held the view and have never 
formally retracted it—as if presenting other views in a form 
chapter on the subject were not a sufficient retraction. As to 
my own expression of the doctrine that “ metamorphism is 
pseudomorphism on a broad scale,” he erie out a fact I had 
overlooked when writing my former article. I examined the 
Mineralogy, and all my papers in this Journal, in search of the 
line above cited, and failed to find it because of its occurrence 
only in a short book notice. I did not deny having used it, 
though ignorant where or when, but only asserted that it was 
not in the Mineralogy. The statement in my article as to the 
views contained in the Mineralogy (4th ed.) is strictly correct. 
My general expressions in that work are strong; but I mention 
as examples, under those views, no rocks except serpentine 
and other ose rocks; and to these, as I have said, I still 
< it. See, for my views in 1854, the sentence on the pre- 
ceding page, cited from it. Moreover T state, in the same chap- 
ter ter (p. pe that few will follow Bischof in all ‘his methods of rock- 
Peo, 6. That Prof: a points out the existence of a Green 
Mountain series of rocks, and a White Mountain series, basing his 
F sbaaee largely on lithological evidence, without any sufficient 
We oP tee: evidence, and without properly defining the limits of 
e two regions.—Mr. Hunt's reply to these objections are con- 
fred to ne points. (1.) In opposition to my remark “ that 
there are gneisses, mica schist ati chloritic and talcoid schists 
in the Taconic series,” he says “that Emmons, the author of the 
Taconic system, expressly excluded there from the crystalline 
rocks.” This exclusion is an easy feat for a speculator with pen 
in hand, like many closet feats; but it is more than herculean in 
actual fact, since the v ery Taconic mountains themselves, that 
is, the very rocks called Taconic by Emmons, are partly gneiss, 
gneissoid mica schist, and chloritic eg schist, as well as 
taleoid schist; and these rocks are so involved together that 
eculation will never bring them into a that kind of order which 
Mr. ee “notions ” require 
2.) To my enquiry whether a ny oe has proved by careful 
Seeeach | that crystals of stauro oy cyanite or andalusite are 
restricted to rocks of a certain geological period, Mr. Hunt 
pony that ‘‘it has not yet been proved that they belong to 
ter period than the one already indicated” (the Pre-cam- 
fan: ; and that “it is only by bringing together observations, 
as I have done, that we can ever hope to determine the geologi- 
oe value of these mineral fossils.” Now the fact is that those 
me Taconic rocks, unquestionably of the Taconic et Seago 
onal to Emmons himself, and, therefore, Hunt attesting, © 
