J. D. Dana—Address of T. Sterry Hunt. 97 
‘ 
Art. XVIL—On the Address before the American Association of 
Prof. T. Sterry Hunt; by James D. Dana. No. IL 
THE aim of Professor Hunt in the latter section of his 
Address was apparently to show that all writers on metamor- 
phism. were deeply in error, except himself and a small circle 
of honored savants sufficient in number for a new School in 
that department of science. And in my reply it was my pur- 
pose, laudable, as I thought, to let him know that Delesse and 
aumann were not to be depended on for the school ; and, 
further, to show that the views of the outsiders were not altoge- 
ther “ contrary jargon,” as he, in his intense love of truth (2.e, 
Ais truth) had said, hoping by this last to quiet that vexation 
of spirit which had been excited by the alleged “ sophistries.” 
But in the reply to my criticisms (page 41 of this volume) Mr. 
Hunt still persists in denouncing multitudes of men for 
Opinions they do not hold, and in claiming Delesse and Nau- 
mann as on his side. He throws out long statements against 
my eleven positions; yet, I have to say, without essentially 
Weakening Xs The multitudes do not need my further aid 
in their defense; and still it seems best once more to state the 
ts with regard to Professor Hunt’s misreadings and misrepre- 
Sentations. It is plain that for some reason he is yet unable to 
read rij py the opinions of others. es 
I will, therefore, set forth again those of my objections to 
Which Prof, Hunt has replied, following the order nearly of his 
paper, and add such remarks as seem necessary. 
Objection 1. That Professor Hunt, while accepting the ordinary 
pews on the origin of most pseudomorphs, rejects them with respect 
to many silicates, such as those consisting of serpentine, steatite, and 
Pimie—I gave the reasons why crystals of serpentine and other 
similar seudomorphs are not true crystals, mentioning facts that 
the fact. ‘The comp $ 00 
S0'on the erystallographer. The change of a crystal making it 
2 pseudomorph is simply a chemical change without a change 
of form by means of hot or cold mineral solutions or vapors 
(agents that have been common in the course of the earth’s 
history ); and since very many such changes, as Mr. Hunt admits, 
have taken place among species not silicates, some of them yet 
Am. Jour, oe Srzres, Von, IV, No. 20.—Aveust, 1872. 
